That's rough man. I understand exactly how you're feeling. I've been dealing with the same problem on and off for the last few months. Here are a few things I tried that helped me. First, this is most a likely psychological rather than physical. When you stick you d1ck in her you can't be thinking about not blowing your load, or trying to last over a minute, or anything of the sort. The more you worry and think about it, the more stressed you'll become, which will only worsen your problem. Also, DO NOT try and distract yourself by thinking of weird **** that might turn you off so you don't come. This will also only make it go quicker. Try and get in tune with your partner, focus on how everything in your body is feelin, and start enjoying yourself damnit!!
You might also want to try changin a few lifestyle habits. I started running more often (3-4 times a week) as well as started eating healthier. A few weeks later, and I haven't blown my load too early once now since the problem stopped. In fact, now I even have trouble finishing myself off during intercourse, and I couldn't be any happier about it. It's hard to say that any of these ideas were direct cause and effect to stop it, but if nothing else, it helped give me confidence and made me stop worrying so much. DON'T GIVE UP ON THIS. Many girls are very understanding about it, and the ones who aren't usually don't respect you anyway and are just there for a lay. Keep workin on it man, keep us updated