I am a thirteen year old male who is quite far in puberty, who has never, ever masturbated. The problem is, when I try, I don't get any pleasure out of it at all, and I'm quite worried. I am unable to pull my foreskin back over my head, and have been to a doctor about that, and he gave me a cream. Could my inability to pull my foreskin back be why I feel no pleasure from masturbation? Thanks in advance.