There are AA meetings for young people. You can call your local AA phone # or the national # and they can tell you where they are. I'm not pushing AA one way or the other, but I've been to general meetings and there are plenty of young people.
If you don't want to hang with AA, it still might be useful to go to at least one meeting just to reassure yourself that you're not alone and see other folks your age living fun lives without alcohol.
When I was in college, getting together with friends always involved drinking. Always. My roommates all drank daily. I can imagine I would have been considered a spoiled sport if I didn't bend my elbow, but I was no exception.
It takes a lot of guts to make a personal decision like you have. I wish you the best.