What stage am i at in puberty, and is my penis still growing?

Hi all i am 18 and i am kind of worried about my penis size. It is just over 6 inches on erect, but the girth is terrible. The girth is pretty bad, its pretty thin and im really freaking out over it. Last time i measured a couple of years ago, it was 5 inches on erect, so its grown and inch. The thing is I still haven't got a full pit of armpit hair, and have not got any facial hair yet. My voice broke about a year ago. Now i know its pretty much genetics but do you think this means my penis is still growing? It looks small on flop, but when its erected the length looks fine its just the damn girth. Any answers? Cheers 5 stars best answer.