I am another non-drinker/non-partier. I have made most of my friends by taking classes. It takes me a while to warm up to people, so I find that classes that go on for at least 6 weeks are best.

I also don't think there is anything wrong with having some people that are activity partners instead of close friends. Friendships can develop that way. If you do things you like to do, you won't be as likely to be bored, too.