vaginapagina | I can orgasm by myself, but not with the boyfriend.

Hey guys.
I searched the archives and found nothing about this specifically, so here goes:
I have masturbated since I was 12, and have never ever had a hard time with giving myself an orgasm. I have a pretty high sex drive, and always considered myself one of the "lucky women" who wouldn't have problems having sexual pleasure in relationships. I was very eager to find that person to share my sexual pleasure with.
Well, I have found him. We've been dating for two+ years, and only lost our virginities to each other this last April. We've fooled around for almost the entirety of our relationship. We originally had planned to wait for marriage to have sex, but just decided to go for it one night (let me tell you, I'm so happy that I didn't wait til my wedding night to find out that sex isn't always what its cracked up to be...).
Anyway.
My problem is, my boyfriend absolutely cannot give me an orgasm. Its not for lack of trying; he will do absolutely anything I ask, and anything he thinks would work. He always puts my pleasure before his, and would kill to get me off. In short, he is wonderful, but I think I am broken. Sometimes I even have to avoid sex just because I don't want to have to masturbate by myself just to have an orgasm. Its terrible. I have only had an orgasm once during sex, from the help of a vibrator. I just don't know what it is.
Its getting really depressing. I'm getting sick of masturbating after we have sex, and I'm getting sick of always having to give myself one if I want one at all. I've never even come CLOSE with him. Please help us. Its doing a number on boyfriend's self esteem, and my general happiness. Thanks!

PS. I have several vibrators, but don't usually use them. I prefer the old-fashioned way.