I feel immature for my age...?

I'm sixteen and despite people (mostly my family and other adults) saying that I'm mature compared to a lot of kids they've seen, I personally don't feel mature in a lot of ways. Like when I look at other American teens my age, I see how much more socially mature they are (and i guess in some ways, they're TOO mature but still) and feel like I'm already supposed to be like that by now. Most of these teens can fend for themselves, for e.g. and look prepared for college. I don't have work experience, I'm still undecided about career choices and feel like I've been raised too carefully by my parents (perhaps a little spoiled...but not in the filthy-rich sense) and am not responsible enough. And I am academically smart, but I guess i'm not street-smart yet, which is what most other teens my age are. How do I become more mature?