Hi. I don't know where to ask this, and I realize that asking primarily virgins isn't the best place, but I hope someone here can help me out.

The problem I'm having is, when I'm having sex, I cum way too quick, and I can't help it. Once I get going, it's like.. 4 minutes max (I don't really know, it could actually be 2 or 10 minutes) before ejaculating. I feel it coming, and I know when it's going to happen, but it's just an inconvenience because I have to change the condom right after that. Of course, I could leave the condom on and keep fucking, but that pretty much defeats the purpose of a condom. Anyways, can anyone help me out? Oh, and it would it have anything to do with me being 15 (fifteen)? Am I not done with puberty yet or something? Thanks.

-Anon.