I can't come from sex and never have I am 21 years old. I comed from my first oral sex experience when I was 18 that's it. Could it be excessive masturbation? I've just entered a relationship and my girlfriend just found out that I haven't comed. What should I do?

Like I said in me other post that got wiped away.
I do not think it could be caused from over masterbating but I may be wrong...
You best bet is to go see your doctor...