Am I the only sober person around?

I'm fifteen and almost everyone in my grade drinks and smokes pot. That's fine, for them. I don't have a problem with people who do. But I just choose not to. I don't have any real reason for why I don't smoke except that I just don't want to right now. And I don't drink because of family problems and I know what it does to people. I'm perfectly content with not doing either of those things. But it's starting to make it hard for me to have a social life. When kids in my grade go out, that's what they do and since I don't get involved in it, I hardly ever go out. I have other friends who don't do that stuff but they live kind of far away from me. And sometimes I honestly feel like the only one who doesn't drink or smoke or anything like that. How should I deal with all this?