I am 22 years old and have been having on and off problems keeping an erection during sex. I have been dating the same girl for over 2 years now and we just started having sex about 9 months ago. It started one night soon after our first time when I may have been too drunk to have sex and it ended with me and her having a big fight about it. Then it was fine for a week or so and it happened again while putting a condom on. So we figured it was just a problem with the condom and she started putting it on me. This helped for a while but the same problem of keeping an erection kept occurring randomly. Now we haven't had sex in over a month and it has happened 3 or 4 times during that time. She has given me oral a few times which it worked then but when we try and have sex something just happens and I loose my erection. I am more attracted to her than I have been to any other girl so I know that is not the problem. It has just gotten worse and worse now she is thinking that we need to break up. I don't know what to do about the problem or how to fix it but I do not want to break up with her. Please help me figure out/fix this problem of keeping an erection.

You should be talking to your doctor about this. Once he rules out any undelyimg physical problems, he will advise you as to what course of action to take. You may be worrying so much about this that your fears could actually be causing you to lose your erection. And there are ED drugs that can be prescribed to you as well, so don't worry, there is help available. Don't try to figure this out by yourself, see your doctor.