I would recommend getting out in the real world and interacting with people as well as online. I'm not exactly sure how old you are, but you sound like you might be young. Teenagers can sometimes be quite mean, and I think it's hard for some of us more sensitive and conscious people to interact with them.
I'm 17, and I have one of the nicest most intelligent group of friends in my school, and they can still be very mean and insensitive. If you are in a situation like me, I think it's helpful to have a thick skin and not let things bother you.
In terms of what yossarian said (which was AWESOME advice by the way), thick skin basically means that no matter what people say or do you will not go "inside your head," and you will stay extroverted.
Good luck to you