hi, i am 24 year old male, for the past few month i, i had masturbate and no semen came out and it hurts when no semen came out. i masturbate since i was 13 years old, and up until now, it was fine, but for the past few months, i found that it is very hard to masturbate, and there is no semen coming out from my penis. Do i have a problem and what is the solution to this??