Hi guys, I'm a 16y old, 5'6" tall for 120 pounds, (point)guard.

I am athletically build, got a little beard, heavy voice.. But it has been a year now, that I'm trying to gain weight, but I didn't win an ounce. It looks to me that my puberty is almost over? (I might be wrong).
So, should I worry about my length? Can I still become a 6-footer?
If yes, what should I do? I'm worrying because it miht affect my game..

Thanks.