<human>: Okay so I started dating this girl at the start of the summer, and we've kept it going for a while now.

We haven't had sex together yet, but we've both performed oral on each other.

I don't have much trouble getting her to orgasm, but she can't seem to make me orgasm. It just goes on for a while, I lose my erection, we start over. Sometimes my mind wanders to things like homework or the fate of the cosmos, but usually I can stay focused on the fact that she's blowing me.

I'm very sexually attracted to her, and to the best of my knowledge she's not doing anything wrong at all. (On a somewhat related note, I'm pretty sure she's doing nothing wrong because she's not my first sexual partner, and even my first ones had trouble bringing me to orgasm. They were prostitutes I hired while in Europe. It was through tremendous concentration that I finished.)

I can masturbate fairly easily, but I think this is going to kill our relationship. My girlfriend feels really shitty because she can't get me off and I can get her off. She won't believe me if I tell her that nobody else has done it easily either. Is there something I can do to make myself orgasm faster? I know this is the opposite of most guys' problems, but it's killing our relationship and I need help with this. 

I'm not nervous at all, and I'm pretty confident about the size of my member, so I can't see why this would be a problem.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: No matter how hard I try, I lose my erection when my girlfriend tries to please me. It's extremely frustrating and I need to orgasm faster.