I had the exact same problem when I first started having sex (you could search my user name, and find some threads, since I also asked TFPers about it).
Don't know what reasons there are behind it, but it is probably just mental, as it was for me. I expected myself to perform, was too thoughtful and didn't relax, and then because too self-conscious of not climaxing. However, after time, it wasn't a problem. The only time it ever feels like it could be (which could be good, in some sense, if it means I can control it for my GFs sake) is when I start worry about it. So, just try to relax, give it time, and realize that it isn't odd at all.
Sim
PS: maybe hitting it from behind could help...in some sense reduce the intimacy enough (since not face to face) so that you aren't thinking so much. Or, it'll just plain feel good. haha
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