Constructive criticism can be hurtful, but if used wisely, then it can go a long way. I am finally in that point of my life where I am trying new things and people are giving me their opinions on what is right and what is wrong. In the end, their criticism helps me even if I didn't care for it when they first told me.
1. Points out flaws.
No matter how mean you think the person is, they are trying to help.
2. New Approach.
The way the person is thinking is just another way of thinking.
3. Don't have to agree.
You don't need to agree, you just have to listen.
4. Communication.
You are constantly talking to someone about your plans and receiving vital advice.
5. It's meant to help you.
Constructive criticism is meant to help you improve so you can be even better.
You probably won't experience that much constructive criticism until you reach that point in your life where you are trying new things. Whether you are sensitive or tough skinned, make sure you listen to others when they give out their opinions on how to change. Most of the time they just want to see you grow into a better person.