I am worried that i dont have much development at the age of 14 so i can't imagine how bad it must be for you at 17
however we can't really help you much unless you could fill in a few details (you don't have to if you don't want to noone is forcing you
1) Do you have armpit hair if so how much?
2) Do you have facial hair if so how much?
3) Do you have pubic hair (around the penis)?
4) How big is you penis when erect?
5) If or when you masterbate do you ejeculate?
Sorry for asking so many questions