I've read through alot of the information and the stretching seems to be working already after a few days. It's amazing that at 17, i never really knew that the foreskin could normally be totally retracted. I can barely move back at all when erect, maybe to just about halfway. However, during masturbation about half a year ago, when almost fully erect, my hand slipped slightly and forced hard, making the forskin retracted fully over the head of the penis. It was a strange feeling, but not sore with no rupturing or bleeding. I am wondering if maybe my problem is related to my masturbation technique, not fully exerting alot of pressure on the penis? Thanks

The technique on its own is probably not the problem, but your overall approach to retraction is. I think the guys who find success probably work at it for a while and continue the habits they developed young.

No matter what, you know now, and you're doing something about it. That's all that really counts.