Isinganyway, that was rude and unkind of your roommate. Being in college, maybe you can find some social group with sobriety as a value? There must be such things on campus, no? Seems larger universities these days have a group for everyone. Or, try some other groups that have your interests at heart.
I know it does not take away the pain of the rejection from your current friends, but you do need some friends to feel comfortable with. I know I feel that. A need for sober friendships. Just someone who does not always thing we need to go for a glass of wine.