I am an INFP, but it took me a couple of years to figure out my type. The only way I finally nailed it down was by reading an article by Heidi Priebe on cognitive functions. The Myers-Briggs letters are a description of how your functions manifest themselves and you use your functions in order from Dominant to Auxiliary, Tertiary and finally, Inferior. Below is each type with their functions, the order of the functions and the descriptions from the article of how the types will act based upon the order of their functions.

ENFP: Ne - Fi – Te – Si

Extroverted Intuition (Ne): Generates new possibilities, synthesizes abstract ideas and picks up on connections in the external environment. Is capable of entertaining multiple contradictory ideas simultaneously as it sees almost every side to every situation. It is predominantly a future-oriented function that examines all the possibilities of what could happen next.

People who lead with extroverted intuition are usually excitable, entreprenurial and highly creative. They intrinsically enjoy debating ideas, exploring various interests and they view almost everything in life as a challenge. They are constantly thinking about what to do or experience next, but have a difficult time sticking with just one idea or plan long

Introverted Feeling (Fi): Is the in-depth analysis of emotional processes and morality. It seeks to break down emotions to their core and understand them as wholly as possible. It also develops a strong internal system of right and wrong, which the Fi user employs to make decisions. Introverted feeling searches for the deeper meaning behind absolutely everything. Introverted feelers are highly aware of and in touch with their own emotions, and when they put themselves in the shoes of others, they can often feel their pain or joy on a personal level.

Extroverted Thinking (Te): Seeks to impose order on the external environment as efficiently and logically as possible. it values productivity above all else and is a results-based, action-oriented function. It naturally implements concrete plans for accomplishing goals and is quick to make decisions.

Introverted Sensing (Si): Is a detail-oriented, information storage function. It takes note of facts, events, and occurrences exactly as they happen and categorizes them, somewhat like an internal filing system. It is a past-oriented function that dwells predominantly on what has been and it often gives way to nostalgia.

INFP: Fi – Ne – Si – Te

Introverted Feeling (Fi): Is the in-depth analysis of emotional processes and morality. It seeks to break down emotions to their core and understand them as wholly as possible. It also develops a strong internal system of right and wrong, which the Fi user employs to make decisions. Introverted feeling searches for the deeper meaning behind absolutely everything. Introverted feelers are highly aware of and in touch with their own emotions, and when they put themselves in the shoes of others, they can often feel their pain or joy on a personal level.

People who lead with introverted feeling are compassionate, analytical and often highly concerned with moral issues. They are usually highly creative or artistic, and may feel as though no one else truly understands who they are deep down. Because their feelings are introverted, Fi-dominant types aren't usually comfortable expressing how they feel outwardly. They have a rich inner world that they want to guard and yet they often secretly wish that others were capable of tapping into it.

Extroverted Intuition (Ne): Generates new possibilities, synthesizes abstract ideas and picks up on connections in the external environment. Is capable of entertaining multiple contradictory ideas simultaneously as it sees almost every side to every situation. It is predominantly a future-oriented function that examines all the possibilities of what could happen next.

Introverted Sensing (Si): Is a detail-oriented, information storage function. It takes note of facts, events, and occurrences exactly as they happen and categorizes them, somewhat like an internal filing system. It is a past-oriented function that dwells predominantly on what has been and it often gives way to nostalgia.

Extroverted Thinking (Te): Seeks to impose order on the external environment as efficiently and logically as possible. it values productivity above all else and is a results-based, action-oriented function. It naturally implements concrete plans for accomplishing goals and is quick to make decisions.

INFJ: Ni – Fe – Ti – Se

Introverted Intuition (Ni): Forms a framework of how the world works based on thorough, abstract analysis of past and current events. It aims to identify the ‘essence’ of ideas, theories, people and situations in order to fit them into a larger schema. It is a forward thinking function that seeks to identify the optimal or most likely outcome of future events.

People who lead with introverted intuition are usually intense, focused and highly perceptive of inconsistencies that arise in their external environment. They enjoy riddles, puzzles and wordplay. They often experience ‘hunches’ or ‘aha’ moments that they may identify as epiphanies. Their intense foresight is a product of their future-oriented introverted intuition subtly pairing with their inferior extroverted sensing.

Extroverted feeling (Fe): Is highly concerned with maintaining social norms and keeping the peace. It is a decision-making function that strives to do what is best for the group and picks up naturally on the emotions of others. It is a mirroring function that may cause the user to have trouble deciphering their own feelings without the input of others. It requires social interaction to stay fulfilled, more so than any other function.

Introverted thinking (Ti): Is an information-gathering function that seeks to form a framework for how the world works on a concrete, tangible level. It is adept at understanding systems and naturally notices inconsistencies within them. It seeks a thorough understanding of how things work – it wants to deconstruct things to look at the individual parts and see how things function as a whole.

Extroverted sensing (Se): Is focused on taking in the world as it exists in the present moment. It is highly in tune with the sights, smells, sounds and general physical stimulus that surrounds it. It lives and thrives in the moment, more so than any other function.

ENFJ: Fe – Ni – Se – Ti

Extroverted feeling (Fe): Is highly concerned with maintaining social norms and keeping the peace. It is a decision-making function that strives to do what is best for the group and picks up naturally on the emotions of others. It is a mirroring function that may cause the user to have trouble deciphering their own feelings without the input of others. It requires social interaction to stay fulfilled, more so than any other function.

People who lead with extroverted feeling are highly reactive to the feelings of others. They seek out social interaction relentlessly, as they feel the happiest and most alive when they are in the company of loved ones. They seek to maintain harmony and keep the peace at all costs – they cannot fully enjoy themselves unless the people around them are healthy, happy and comfortable.

Introverted Intuition (Ni): Forms a framework of how the world works based on thorough, abstract analysis of past and current events. It aims to identify the ‘essence’ of ideas, theories, people and situations in order to fit them into a larger schema. It is a forward thinking function that seeks to identify the optimal or most likely outcome of future events.

Extroverted sensing (Se): Is focused on taking in the world as it exists in the present moment. It is highly in tune with the sights, smells, sounds and general physical stimulus that surrounds it. It lives and thrives in the moment, more so than any other function.

Introverted thinking (Ti): Is an information-gathering function that seeks to form a framework for how the world works on a concrete, tangible level. It is adept at understanding systems and naturally notices inconsistencies within them. It seeks a thorough understanding of how things work – it wants to deconstruct things to look at the individual parts and see how things function as a whole.

ISTJ: Si – Te – Fi – Ne

Introverted sensing (Si): Is a detail-oriented, information storage function. It takes note of facts, events and occurrences exactly as they happen and categorizes them, somewhat like an internal filing system. This is a past-oriented function that dwells predominantly on what has been and it often gives way to nostalgia.

People who lead with introverted sensing are organized and structured, as they believe in being prepared for any potential mishap. They hold tradition in high esteem and believe that the tried and true method is always the best way of getting things done. Introverted sensors believe that the future will repeat the past, more so than any other type.

Extroverted Thinking (Te): Seeks to impose order on the external environment as efficiently and logically as possible. it values productivity above all else and is a results-based, action-oriented function. It naturally implements concrete plans for accomplishing goals and is quick to make decisions.

Introverted Feeling (Fi): Is the in-depth analysis of emotional processes and morality. It seeks to break down emotions to their core and understand them as wholly as possible. It also develops a strong internal system of right and wrong, which the Fi user employs to make decisions. Introverted feeling searches for the deeper meaning behind absolutely everything. Introverted feelers are highly aware of and in touch with their own emotions, and when they put themselves in the shoes of others, they can often feel their pain or joy on a personal level.

Extroverted Intuition (Ne): Generates new possibilities, synthesizes abstract ideas and picks up on connections in the external environment. Is capable of entertaining multiple contradictory ideas simultaneously as it sees almost every side to every situation. It is predominantly a future-oriented function that examines all the possibilities of what could happen next.

ESTJ: Te – Si – Ne – Fi

Extroverted thinking (Te): Seeks to impose order on the external environment as efficiently and logically as possible. It values productivity above all else and is a results-based, action-oriented function. It naturally implements concrete plans for accomplishing goals and is quick to make decisions.

People who lead with extroverted thinking are frank, decisive and highly productive in every capacity. They are natural leaders in the workplace as they are quick to take charge and impose order. Dominant extroverted thinkers may come across as bossy or opinionated to those who lack the function, but in reality they are simply pointing out what they believe to be the most efficient course of action for everyone involved.

Introverted Sensing (Si): Is a detail-oriented, information storage function. It takes note of facts, events, and occurrences exactly as they happen and categorizes them, somewhat like an internal filing system. It is a past-oriented function that dwells predominantly on what has been and it often gives way to nostalgia.

Extroverted Intuition (Ne): Generates new possibilities, synthesizes abstract ideas and picks up on connections in the external environment. Is capable of entertaining multiple contradictory ideas simultaneously as it sees almost every side to every situation. It is predominantly a future-oriented function that examines all the possibilities of what could happen next.

Introverted Feeling (Fi): Is the in-depth analysis of emotional processes and morality. It seeks to break down emotions to their core and understand them as wholly as possible. It also develops a strong internal system of right and wrong, which the Fi user employs to make decisions. Introverted feeling searches for the deeper meaning behind absolutely everything. Introverted feelers are highly aware of and in touch with their own emotions, and when they put themselves in the shoes of others, they can often feel their pain or joy on a personal level.

ISTP: Ti – Se – Ni – Fe

Introverted thinking (Ti): Is an information-gathering function that seeks to form a framework for how the world works on a concrete, tangible level. It is adept at understanding systems and naturally notices inconsistencies within them. Introverted thinking seeks a thorough understanding of how things work – it wants to deconstruct things to look at the individual parts and see how things function as a whole.

People who lead with introverted thinking are logical, systematic and objective to a fault. They enjoy finding ‘short-cuts’ that increase efficiency within a given system. Ti-dominants are often heavily introverted, as they take a great deal of time to understand how things work before they feel comfortable sharing or acting on their knowledge.

Extroverted sensing (Se): Is focused on taking in the world as it exists in the present moment. It is highly in tune with the sights, smells, sounds and general physical stimulus that surrounds it. It lives and thrives in the moment, more so than any other function.

Introverted Intuition (Ni): Forms a framework of how the world works based on thorough, abstract analysis of past and current events. It aims to identify the ‘essence’ of ideas, theories, people and situations in order to fit them into a larger schema. It is a forward thinking function that seeks to identify the optimal or most likely outcome of future events.

Extroverted feeling (Fe): Is highly concerned with maintaining social norms and keeping the peace. It is a decision-making function that strives to do what is best for the group and picks up naturally on the emotions of others. It is a mirroring function that may cause the user to have trouble deciphering their own feelings without the input of others. It requires social interaction to stay fulfilled, more so than any other function.

ESTP: Se – Ti – Fe – Ni

Extroverted sensing (Se): Is focused on taking in the world as it exists in the present moment. It is highly in tune with the sights, smells, sounds and general physical stimulus that surrounds it. Extroverted sensing lives and thrives in the moment, more so than any other function.

People who lead with extroverted sensing are often naturally athletic, highly impulsive and enjoy ever-changing stimuli. They place a high value on aesthetics and lust after the ‘finer things in life.’ Extroverted sensors usually aren’t interested in over-analyzing a situation – they simply see what they want and they go for it. These types tend to exude a natural sense of confidence, as they are usually quite sure of who they are and what they want.

Introverted thinking (Ti): Is an information-gathering function that seeks to form a framework for how the world works on a concrete, tangible level. It is adept at understanding systems and naturally notices inconsistencies within them. Introverted thinking seeks a thorough understanding of how things work – it wants to deconstruct things to look at the individual parts and see how things function as a whole.

Extroverted feeling (Fe): Is highly concerned with maintaining social norms and keeping the peace. It is a decision-making function that strives to do what is best for the group and picks up naturally on the emotions of others. It is a mirroring function that may cause the user to have trouble deciphering their own feelings without the input of others. It requires social interaction to stay fulfilled, more so than any other function.

Introverted Intuition (Ni): Forms a framework of how the world works based on thorough, abstract analysis of past and current events. It aims to identify the ‘essence’ of ideas, theories, people and situations in order to fit them into a larger schema. It is a forward thinking function that seeks to identify the optimal or most likely outcome of future events.

INTJ: Ni – Te – Fi – Se

Introverted intuition (Ni): Forms a framework of how the world works based on thorough, abstract analysis of past and current events. It aims to identify the ‘essence’ of ideas, theories, people and situations in order to fit them into a larger schema. Introverted intuition is a forward thinking function that seeks to identify the optimal or most likely outcome of future events.People who lead with introverted intuition are usually intense, focused and highly perceptive of inconsistencies that arise in their external environment. They enjoy riddles, puzzles and wordplay. They often experience ‘hunches’ or ‘aha’ moments that they may identify as epiphanies. Their intense foresight is a product of their future-oriented introverted intuition subtly pairing with their inferior extroverted sensing.

Extroverted thinking (Te): Seeks to impose order on the external environment as efficiently and logically as possible. It values productivity above all else and is a results-based, action-oriented function. It naturally implements concrete plans for accomplishing goals and is quick to make decisions.

Introverted Feeling (Fi): Is the in-depth analysis of emotional processes and morality. It seeks to break down emotions to their core and understand them as wholly as possible. It also develops a strong internal system of right and wrong, which the Fi user employs to make decisions. Introverted feeling searches for the deeper meaning behind absolutely everything. Introverted feelers are highly aware of and in touch with their own emotions, and when they put themselves in the shoes of others, they can often feel their pain or joy on a personal level.

Extroverted sensing (Se): Is focused on taking in the world as it exists in the present moment. It is highly in tune with the sights, smells, sounds and general physical stimulus that surrounds it. Extroverted sensing lives and thrives in the moment, more so than any other function.

INTP: Ti – Ne – Si – Fe

Introverted thinking (Ti): Is an information-gathering function that seeks to form a framework for how the world works on a concrete, tangible level. It is adept at understanding systems and naturally notices inconsistencies within them. Introverted thinking seeks a thorough understanding of how things work – it wants to deconstruct things to look at the individual parts and see how things function as a whole.

People who lead with introverted thinking are logical, systematic and objective to a fault. They enjoy finding ‘short-cuts’ that increase efficiency within a given system. Ti-dominants are often heavily introverted, as they take a great deal of time to understand how things work before they feel comfortable sharing or acting on their knowledge.

Extroverted Intuition (Ne): Generates new possibilities, synthesizes abstract ideas and picks up on connections in the external environment. Is capable of entertaining multiple contradictory ideas simultaneously as it sees almost every side to every situation. It is predominantly a future-oriented function that examines all the possibilities of what could happen next.

Introverted Sensing (Si): Is a detail-oriented, information storage function. It takes note of facts, events, and occurrences exactly as they happen and categorizes them, somewhat like an internal filing system. It is a past-oriented function that dwells predominantly on what has been and it often gives way to nostalgia.

Extroverted feeling (Fe): Is highly concerned with maintaining social norms and keeping the peace. It is a decision-making function that strives to do what is best for the group and picks up naturally on the emotions of others. It is a mirroring function that may cause the user to have trouble deciphering their own feelings without the input of others. It requires social interaction to stay fulfilled, more so than any other function.

ENTJ: Te – Ni – Se – Fi

Extroverted thinking (Te): Seeks to impose order on the external environment as efficiently and logically as possible. It values productivity above all else and is a results-based, action-oriented function. Extroverted thinking naturally implements concrete plans for accomplishing goals and is quick to make decisions.

People who lead with extroverted thinking are frank, decisive and highly productive in every capacity. They are natural leaders in the workplace as they are quick to take charge and impose order. Dominant extroverted thinkers may come across as bossy or opinionated to those who lack the function, but in reality they are simply pointing out what they believe to be the most efficient course of action for everyone involved.

Introverted intuition (Ni): Forms a framework of how the world works based on thorough, abstract analysis of past and current events. It aims to identify the ‘essence’ of ideas, theories, people and situations in order to fit them into a larger schema. Introverted intuition is a forward thinking function that seeks to identify the optimal or most likely outcome of future events.

Extroverted sensing (Se): Is focused on taking in the world as it exists in the present moment. It is highly in tune with the sights, smells, sounds and general physical stimulus that surrounds it. Extroverted sensing lives and thrives in the moment, more so than any other function.

Introverted Feeling (Fi): Is the in-depth analysis of emotional processes and morality. It seeks to break down emotions to their core and understand them as wholly as possible. It also develops a strong internal system of right and wrong, which the Fi user employs to make decisions. Introverted feeling searches for the deeper meaning behind absolutely everything. Introverted feelers are highly aware of and in touch with their own emotions, and when they put themselves in the shoes of others, they can often feel their pain or joy on a personal level.

ENTP: Ne – Ti – Fe – Si

Extroverted intuition (Ne): Generates new possibilities, synthesizes abstract ideas and picks up on connections in the external environment. Extroverted intuition is capable of entertaining multiple contradictory ideas simultaneously as it sees almost every side to every situation. It is predominantly a future-oriented function that examines all the possibilities of what could happen next.

People who lead with extroverted intuition are usually excitable, entrepreneurial and highly creative. They intrinsically enjoy debating ideas, exploring various interests and they view almost everything in life as a challenge. They are constantly thinking about what to do or experience next, but have a difficult time sticking with just one idea or plan long-term.

Introverted thinking (Ti): Is an information-gathering function that seeks to form a framework for how the world works on a concrete, tangible level. It is adept at understanding systems and naturally notices inconsistencies within them. Introverted thinking seeks a thorough understanding of how things work – it wants to deconstruct things to look at the individual parts and see how things function as a whole.

Extroverted feeling (Fe): Is highly concerned with maintaining social norms and keeping the peace. It is a decision-making function that strives to do what is best for the group and picks up naturally on the emotions of others. It is a mirroring function that may cause the user to have trouble deciphering their own feelings without the input of others. It requires social interaction to stay fulfilled, more so than any other function.

Introverted Sensing (Si): Is a detail-oriented, information storage function. It takes note of facts, events, and occurrences exactly as they happen and categorizes them, somewhat like an internal filing system. It is a past-oriented function that dwells predominantly on what has been and it often gives way to nostalgia.

ISFJ: Si – Fe – Ti – Ne

Introverted sensing (Si): Is a detail-oriented, information storage function. It takes note of facts, events and occurrences exactly as they happen and categorizes them, somewhat like an internal filing system. This is a past-oriented function that dwells predominantly on what has been and it often gives way to nostalgia.

People who lead with introverted sensing are organized and structured, as they believe in being prepared for any potential mishap. They hold tradition in high esteem and believe that the tried and true method is always the best way of getting things done. Introverted sensors believe that the future will repeat the past, more so than any other type.

Extroverted feeling (Fe): Is highly concerned with maintaining social norms and keeping the peace. It is a decision-making function that strives to do what is best for the group and picks up naturally on the emotions of others. It is a mirroring function that may cause the user to have trouble deciphering their own feelings without the input of others. It requires social interaction to stay fulfilled, more so than any other function.

Introverted thinking (Ti): Is an information-gathering function that seeks to form a framework for how the world works on a concrete, tangible level. It is adept at understanding systems and naturally notices inconsistencies within them. Introverted thinking seeks a thorough understanding of how things work – it wants to deconstruct things to look at the individual parts and see how things function as a whole.

Extroverted intuition (Ne): Generates new possibilities, synthesizes abstract ideas and picks up on connections in the external environment. Extroverted intuition is capable of entertaining multiple contradictory ideas simultaneously as it sees almost every side to every situation. It is predominantly a future-oriented function that examines all the possibilities of what could happen next.

ISFP: Fi – Se – Ni – Te

Introverted feeling (Fi): is the in-depth analysis of emotional processes and morality. It seeks to break down emotions to their core and understand them as wholly as possible. It also develops a strong internal system of right and wrong, which the Fi user employs to make decisions. Introverted feeling searches for the deeper meaning behind absolutely everything. Introverted feelers are highly aware of and in touch with their own emotions, and when they put themselves in the shoes of others, they can often feel their pain or joy on a personal level.

People who lead with introverted feeling are compassionate, analytical and often highly concerned with moral issues. They are usually highly creative or artistic, and may feel as though nobody else truly understands who they are deep down. Because their feelings are introverted, Fi-dominant types aren’t always comfortable expressing how they feel outwardly. They have a rich inner world that they want to guard and yet they often secretly wish that others were capable of tapping into it.

Extroverted sensing (Se): Is focused on taking in the world as it exists in the present moment. It is highly in tune with the sights, smells, sounds and general physical stimulus that surrounds it. Extroverted sensing lives and thrives in the moment, more so than any other function.

Introverted intuition (Ni): Forms a framework of how the world works based on thorough, abstract analysis of past and current events. It aims to identify the ‘essence’ of ideas, theories, people and situations in order to fit them into a larger schema. Introverted intuition is a forward thinking function that seeks to identify the optimal or most likely outcome of future events.

Extroverted thinking (Te): Seeks to impose order on the external environment as efficiently and logically as possible. It values productivity above all else and is a results-based, action-oriented function. Extroverted thinking naturally implements concrete plans for accomplishing goals and is quick to make decisions.

ESFJ: Fe – Si – Ne – Ti

Extroverted feeling (Fe): is highly concerned with maintaining social norms and keeping the peace. It is a decision-making function that strives to do what is best for the group and picks up naturally on the emotions of others. It is a mirroring function that may cause the user to have trouble deciphering their own feelings without the input of others. Extroverted feeling requires social interaction to stay fulfilled, more so than any other function.

People who lead with extroverted feeling are highly reactive to the feelings of others. They seek out social interaction relentlessly, as they feel the happiest and most alive when they are in the company of loved ones. They seek to maintain harmony and keep the peace at all costs – they cannot fully enjoy themselves unless the people around them are healthy, happy and comfortable.

Introverted sensing (Si): Is a detail-oriented, information storage function. It takes note of facts, events and occurrences exactly as they happen and categorizes them, somewhat like an internal filing system. This is a past-oriented function that dwells predominantly on what has been and it often gives way to nostalgia.

Extroverted intuition (Ne): Generates new possibilities, synthesizes abstract ideas and picks up on connections in the external environment. Extroverted intuition is capable of entertaining multiple contradictory ideas simultaneously as it sees almost every side to every situation. It is predominantly a future-oriented function that examines all the possibilities of what could happen next.

Introverted thinking (Ti): Is an information-gathering function that seeks to form a framework for how the world works on a concrete, tangible level. It is adept at understanding systems and naturally notices inconsistencies within them. Introverted thinking seeks a thorough understanding of how things work – it wants to deconstruct things to look at the individual parts and see how things function as a whole.

ESFP: Se – Fi – Te – Ni

Extroverted sensing (Se): Is focused on taking in the world as it exists in the present moment. It is highly in tune with the sights, smells, sounds and general physical stimulus that surrounds it. Extroverted sensing lives and thrives in the moment, more so than any other function.

People who lead with extroverted sensing are often naturally athletic, highly impulsive and enjoy ever-changing stimuli. They place a high value on aesthetics and lust after the ‘finer things in life.’ Extroverted sensors usually aren’t interested in over-analyzing a situation – they simply see what they want and they go for it. These types tend to exude a natural sense of confidence, as they are usually quite sure of who they are and what they want.

Introverted feeling (Fi): is the in-depth analysis of emotional processes and morality. It seeks to break down emotions to their core and understand them as wholly as possible. It also develops a strong internal system of right and wrong, which the Fi user employs to make decisions. Introverted feeling searches for the deeper meaning behind absolutely everything. Introverted feelers are highly aware of and in touch with their own emotions, and when they put themselves in the shoes of others, they can often feel their pain or joy on a personal level.

Extroverted thinking (Te): Seeks to impose order on the external environment as efficiently and logically as possible. It values productivity above all else and is a results-based, action-oriented function. Extroverted thinking naturally implements concrete plans for accomplishing goals and is quick to make decisions.

Introverted intuition (Ni): Forms a framework of how the world works based on thorough, abstract analysis of past and current events. It aims to identify the ‘essence’ of ideas, theories, people and situations in order to fit them into a larger schema. Introverted intuition is a forward thinking function that seeks to identify the optimal or most likely outcome of future events.