Hi, I'm a newbie, but when I saw this post and others concerning sexual health, I had to register and respond.
I once had the same problem you have: premature ejaculation. Regardless of which definition you look up, premature ejaculators know that we have a problem whether the girl has an orgasm or not. Most men do have this problem regardless of the bravado you may read on internet message boards
Anyway, there are a few different techniques you can try to get rid of this problem. First, you may want to try the squeeze and hold tech. When you feel you are close to climax, pull out and pinch the head of your penis for about 5-10 seconds. This will hold off an ejaculation (providing you pulled out soon enough). Repeated tries of this will eventually de-sentisize your penis to the point where you can control your orgasm. Granted, this didn't work for me, but it works for most people.
I think about other things or blank out my mind during sex. It has worked wonders for me. Now that I'm not thinking about how good she feels, et cetera, I am able to concetrate on my sexual technique instead and reach an orgasm when she is ready for me to have one. I'm sure you've heard of this in the movies, thinking about baseball or Jeopardy!, or any number other things that stimulate the other half of your brain, but it works. I'd suggest reading a book if that were somewhat feasible for you (since it uses your left hemisphere vs. the right hemisphere), but since it isn't, either try the squeeze and hold or think about other things techniques. If neither of these work for you, post again. I'll be more than happy to answer any question you may have.