hi, i'm a 17 yr old guy. When i was 11, i had an infected penis or something like that but i couldn't remember. i had a small penis hole and had difficulty unrinating.,then i circumsized and had a minor surgery and everything was okay, i could urinate and the doctor told me i'd be a normal man but he said my penis will be sensitive.then i started masturbating when i was 13. i kept doing it everyday as i got addicted to it. But when I was around 15 years old , i suddenly had this burning pain that lasted for about 20-30 minutes after i ejaculate. then the pain would stop. It just comes and goes. Then early this year i had a pimple on my penis, it was there for 2 months then it dissapeared. Then now, i haven't been having that burning pain after ejaculation anymore but I have this slight sharp pain in my penis while I am ejaculating. Sometimes it hurts and sometimes it doesn't . Is this be because of masturbating too much? like everyday? sometimes 3 times a day? I'm worried sick. Shed some light please!