im 17 yrs old, and cannot cum during masturbation...im not sure exactly what is wrong with me I thought maybe I am a late bloomer, but I have come to the conclusion that there must be a problem here. It goes like this. I start masturbating and it feels good..and then i hit this point when it gets hard that it stops feeling good and when i try to ejaculate and beat it hard and fast my dick starts to hurt...Help