Im 19yrs old and i have a hard foreskin it doesnt slip much down.do i need a circumscision ?i mean will it affect sex or pain during sex?

Here are some ...: Clinically, you would be probably okay with what you have because you have seemed free of the adverse effects from "hard foreskin"; but, it's hard to advise if you need circumcision without a direct look. So, see a urologist timely to decide how to correct your problem as needed.

Hard to say: An evaluation by a urologist would provide enough direct information for you to make this determination. A full circumcision may not be necessary to solve your problem. Either way, the best answers for your question require a more direct evaluation.