i m 17, and i have some pubic hair, no armpit hair, a very small mustache, no beard, and no change in voice. my penis is about 3.75 inches at erection. people look at me and think tht i m 15! o.O tht is so awful. do, i really have a problem, or a late puberty, or some nutrient i lack in my body? plz tell me something about it! :-(