I successfully enlisted my floor in the dorms to have an intervention for my alcoholic roommate. Twenty of us took a pledge not to drink at all to help him out, and granted five or six fell off the wagon but the rest of us continued to have a good sober time, hanging out playing cards and playing video games during our downtime, and pretty soon, the girls started coming to hang out too. There's plenty of people out there that don't want to drink, and the people who only want to be your friend if you pass certain conditions (if you drink, do drugs, whatever) aren't worth having as friends.
Don't change yourself, especially in damaging ways, for the purposes of fitting in. I have, in the past, and I regret it still.