I'm 16. I feel like I'm way too mature for my friends, but I guess it's just because i've experienced more than they have.
I kind of feel excluded from my friends at my school, because i go to a small private school and 'cause they seem behind me maturity-wise. :(
But they have to catch up some time, so I chat online with people that are the same maturity as me so I feel like I'm around people like me. Also, I hang out with a ton of older people downtown (which is both good and bad), and I have a great group of mature friends like me that live a little ways away.
But, yes, most of the people here seem really mature. And that's really cool.