I'm 22 and uncircumcised. my foreskin can be easily pulled back and it stays back till i pull it back up. no discomfort. problem arises when my foreskin is pulled back and i get a boner, the foreskin pains a little. what should i do?

I would consult with a urologist. A simple office procedure could likely loosen the foreskin enough to solve the problem.

Foreskin might be just a bit tight so when not erect it is OK but tight on erection. Suggst pulling it back gently as far as it can be pulled back acouple of times a day using a lubricant. In a few weeks it might become more pliable. If not , and it continues to bother you you might need a circumcision. I think the method might work. Good luck,