A lot of women (read:most) don't orgasm during intercourse. I think the posters on here are just lucky.
But seriously, most women just orgasm during oral, or maturbation, but not intercourse. It doesn't really hit the right spot anatomically for those women.
If you're pretty young, still a teenager, then things will probably get better.
Also, listen to LoveLine, 10-12 pm pacific time, on the radio, if you're in the US. They talk about this subject a TON. They're usually on alternative radio stations. Here's a link to a streaming version:
mms://wmc1.liquidviewer.net/KNDD