I am a 17 year old, I started to noticing since last few months that during erection my foreskin of penis pains a lot to pull back, it has been happening since a long time but I didn't pay much attention to it. When not erected, I am able to pull it back easily but during erection it pains a lot, it doesn't have any effect of erection, ejaculation or stamina, but I am afraid that it will create problems during future intercourse, I don't feel anything normally or even during erection or masturbation but whenever during erection I try to pull it back it pains a lot, what should I do about this , will it become a hazard during intercourse ?