You most likely won't want to hear this, but if you have no problem getting or maintaining an erection at home, but do have a problem with it when around her, then it may be one of a few things.

1.) You two are just not right together and subconsciously you know it, even though you may want it work for whatever reasons.

2.) You two may be right for each other, but you yourself are not actually quite ready mentally or emotionally to have sex, no matter how much your body may be screaming otherwise.

3.) You are under a lot of stress, and may need to learn how to handle it and how to relax. Just the idea of having sex may be stressful for you. I know it sounds odd, but it's actually a rather common anxiety. Even has it's own term "performance anxiety."

4.) Underlying fear of the possible consequences (pregnancy, STDs, getting caught, etc. etc.)

The reason I say this is many men of all ages suffer from the same type problem (no problems with erections when alone, problems within a relationship.)

Personally, I wouldn't advocate pushing it, and I wouldn't advocate having sex so young. I know, I know, that's not what you want to hear and you and your friends and your girlfriend and many other people can all give all kinds of reasons and excuses to the contrary.

However, having sex is much more than just a physical act and carries with it a LOT of responsibility. At 15 are you old enough to be a father if the condom breaks? You *are* using a condom, aren't you? (BTW, if she is on the pill, it is not 100% effective. I know that as a fact and not just some scare tactic statistic - I was on the pill when I got pregnant with my second son.) After all, if you help create a child, you hold half the responsibility for that child for the rest of your life.

When it *is* right and you *are* ready, you'll know it deep inside. Don't rush it "just because." You deserve better than that out of life. =)

First of all, I understand this is the 2000's but I'm appalled that you are having sex at 15. Shouldn't you be doing your homework and preparing yourself for college? If you get this girl pregnant, be prepared to start handing over half of every paycheck that you get when you start working. Believe me, at 15 you can't see things the way you will when you get around 30. You will look back over all of this and say, "I wish I had waited". What is the big rush anyway to have sex? You are still a child. I'm not giving you any advice on erections and masturbating or anything; Man you can't even spell masturbating right let alone be doing that. Your parents need to be getting on to you about having sex at a young age. YOU NEED TO BE GOING TO SCHOOL AND NOT HITTING ON GIRLS AT THIS AGE!!!!!!!