It would be good it the foreskin retracts naturally as you enter a woman. If not, it can be too tight and sensitive for you. You are likely to *** way too soon due to the anxiety. It is also harder to enter a woman when your foreskin doesn't retract, unless you use a lot of lubricant, or she is very wet. Even then, if she is tight, it's going to be hard.
You have two choices: go to a doctor and get your foreskin loosened. It can be done. I know guys who got this done. The other option is to get a circumcision.
I would highly recommend keeping your foreskin and getting it loosened. A penis with a foreskin is way more fun for both the guy and the girl.