I can't climax...

By myself and with my vibrator I can reach tons of orgasms within minutes, one followed by the other and it is complete bliss. I have never reached orgasm while having penetrative sex with a partner, and I'm not completely sure why. I don't know if I'm embarrassed to squirt, but I haven't even squirted alone. To be honest, masturbation has been the only way I have gotten off other than being eaten out. I don't know what it is and I feel so weird when my partner finishes within minutes and I'm over here completely turned off