I've noticed I can be a bit more serious than both my friends and I would like. I enjoy talking about things that most other teenagers would find incredibly boring. I have a couple friends who can stand chatting about things I like to talk about, one of the two appears to enjoy it almost as much as I do. Others, get very annoyed by it -_-'. I'm not sure if being boring and liking mature topics (FYI the topics I'm speaking of are science and politic based) necessarily makes me mature though. I still have issues ordering food from a restaurant do to my poor social skills :/. I still enjoy cartoons from when I was little, such as: Power Puff Girls, Invader Zim (Who Doesn't?), Courage the Cowardly Dog, Dexter's Laboratory, and many more. Finally, something in my favor, I can honestly say I dislike immaturity among people my age, and I'm pretty good at spotting it. I also dislike looking "silly" even if the goal was to get a laugh.
I'd say in the end, I still end up having the maturity of an inexperienced adult. One that has a lot knowledge and dislikes people who don't but has hard time doing anything practical with it.