A job is great solution. Not only do you get to meet a lot of other teens and young adults, but you'll make money, too!

I'd also look for local organizations that align with your interests. When I was a (rather geeky) teen, I was interested in hiking, computers, radios, and public service, so I met a lot of my friends after joining my local Civil Air Patrol unit and getting involved in Search and Rescue.

If you're interested in writing, maybe check the local library for writing groups. Your school might have a writers club, or French group of sorts, too.