Open Question: How do I get over feeling this way?

Since about 15 years old, I've really pulled out in dealing with people. I used to go out at all times before, and sometimes when I should not. I am 20, and are rarely out. Maybe once in a blue moon, but nothing more. I have a very close friend and one I have been with her boyfriend of three years. Other people, I am from. I really do not talk about my family and it is as if I do not want to make new friends or make new friends. Any person who in any healthy and has made similar ones? Additional Information: I fight off depression ,16-18, but I am in school full time now I honestly, I also have scholars busy downturn. However, this is a factor?