You are sixteen going on seventeen, buddy, it's time to stink.
Better be wareful, wasteful and dareful (sorry, I made that word up), buddy you're on the brink.
And if you can guess where that misquote came from I'll rep you forever.
Seriously, all those who said you're young are right. You haven't had the experience yet that someone older i.e. late teens, twenties, thirties, etc. has had. You're still growing.
Yes, there are some hotshot young writers out there--very few. Do NOT compare yourself to them at all. Never. That's setting yourself up for failure right away. FWIW, just write. Even if it blows chunks, just write something down, make it as coherent as possible, and don't worry about sucking at it. You've got other, more important things to worry about, like school, zits, dates, and so on. Writing will always be there.
I'm almost fifty-two (horror!) and I didn't start writing until I was forty-eight. I got published at forty-nine, but I digress, and to be honest, if I knew then what I know now, my first novel would have been a LOT better. So you do have time on your side. Just write, read, and write some more.