Hi there, i'm wanting some good advice on my problem, I'm 17 years old and in a serious relationship but im still yet to have sex, Because when my penis is erect my foreskin will not go over the head, in fact you can only just see the head when its erect! another problem is lumps most visible when erect, the best way to describe this problem is by a picture i found on google.

http://www.atoute.org/images/penis/grains_de_fordyce.jpg

does anyone know what i should do ?
Im really nervous about going to a doctor.