Well, i feel short for my age, too. I'm 16 and i'm just above 5'8". All of my friends are like 5'10" and i fell so left out.
But don't worry, you are still pretty young to worry about it, puberty actually doesn't completely end until about the age of 25, that is when your body has completely stopped changing. So don't get all worked up, just go on with life. lol