Puberty and im very scared!!!!!!!!!?

Im 15 and 9 months its about to be summer its may 30th my 16th bday is august 29th and im scared if im done growing.. down there.. im 5ft 8 but im supposed to be 510-511 i got a good build i have hair above my lip and a little under and this is supposed to be my last growth spurt this summer but the thing is my penis is 2.5 flaccid and about 5 erect maybe an itty bit less and its skinny... i have pubic hair and arm pit hair but not a happy trail (hair going up to belly button) and girls find me attractive but im scared to let them get in my pants am i a fine size? will my penis grow length wise anymore? my balls hang but they arent hung like a ton but i was born like kinda built never really worked for it but my doctor doesnt know taht and is assuming im in the end of my 4th stage of puberty im concerened if my penis is done growing lenght wise? will it grow more from now untill im 16 so 3 months? i dont have reallly and side burn hair to shave and my voice is deep but not extremely i only weigh 132lbs and im just scared outta my mind if my penis is done growing length wise...? please help