Why do I love being bad all the time?

I'm 19. I'm addicted to bad behavior. For example: I don't drink, I don't do drugs, I don't have premarital , I don't break the law, & I don't go to parties. I love being bad. Noone wants to be my friend. They claim I'm self-righteous. I'm a Christian, so I get a lot of hate from people. I eat healthy & work out. So my family is jealous of me being in shape. They're all overweight. I'm going to college. I spend my Friday & Saturday nights studying at the library. I have no friends. Never had a girlfriend. So I feel like I'm a bad guy. Why do I love being this way? It feels good. Any advice