Neomarxist - I understand that especially at a younger age, the peer pressure is very strong to drink. But, when I started running and doing races, I was introduced to a whole new group of people who lived an extremely healthy lifestyle. These people went for long runs on Saturday nights. They didn't go to bars, but after a long run, they would all end up in a coffee shop laughing, having fun, and really enjoying one another's company.
They would go camping together - and not sit around the camp fire drinking, but would go for a long hike.
So, it may be helpful to find a new interest that puts you around people who are doing something athletic (and there are a lot of choices - you don't have to hang out with the marathoners if that isn't your thing. One of my friends got into paint ball, for instance).
And besides, most people who are very active are fit and attractive, so it can be a great place to meet people.