Why don't I want to hang out with my friends anymore?

Probably because you've spent so much time at home when you was sick, you have got used to it, and now you dont want to go out. Or because you soent so much time at home, you have become depressed, so you dohnt feel like going out any where. You need to force yourself to go out with your friends. You'll have a good time, and you'll feel good after aswell. =D