I'm going to chime in with the "it's mental" answer. But I think you've figured that out all on your own. That's good since there are a lot of guys that never do. If you think that there's something physically wrong, then see a doctor, but I don't think that this is much more than performance anxiety, and that's easily dealt with.
It's good that you want to stop masturbating. That will help. My guess is that your willpower will crumble before you want it to, but that's fine. If you're going to masturbate, try changing it up - different hand, more/less/no lube, different position (sitting, standing, lying down). Get out of your routine.
When you're with your girlfriend, though, Jewels gave you some awesome advice above. Don't worry about you - you can beat off later if that's what you have to do. Make it all about her. Get her off as many times and ways as you can. Be creative. Take the pressure of you to perform with your penis. Make it about you performing in entirely different ways.
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