I have written about being introverted before but I wanted to delve deeper into why everyone (not just introverts) need alone time.
Some people thrive in large groups but having to do that all the time cannot be healthy. Everybody needs their time away to recuperate and enjoy not having to deal with others.
It is a cliche but it is true: life is short. We should not waste our lives always being reliant on others. Finding ways to occupy yourself is the best course of action because only you truly know what you like.
There are days where I do not want to be near people and that is okay. While I have a tendency to get bored easily, I can always find a way to make sure I have something to do while I am alone.
Others should be able to do the same thing. Being alone is a gift people need to appreciate. People can be hard to put up with so everybody needs to be able to step back and realize that time alone will help.
You can read books, watch movies, write, daydream, whatever you please. There are no restrictions on where your imagination may take you. Feeling like you cannot have fun without others around is just a cop-out. Life offers many opportunities that just need to be searched for to find.
If you can afford it, go on a vacation by yourself and see the things that truly matter to you. There would be no one to hold you back and you would not have to compromise with them. You could go and enjoy whatever your heart desires whether it be going to the beach or going sightseeing.
Allow yourself to be alone from time to time. It does not have to be all the time but at least try to find happiness without others around.