By the way, how old are you now?
You said you had your first provoked orgasm when you were 17. So, assuming you are not still 17 (bad if you are since you have to be 18 to join this site), I was wondering if you’ve had sex yet - and, or, have you started jerking off more regularly? Unless you’ve had any irregularities with those, I don’t see what you’d be worried about in the first place.