Flyflyaway - 20-25% of women never or seldom get an orgasm. Perhaps you are in this group. But I think many in this group never tried hard or did not care, or did not know what they were missing. Some men have "performance anxiety", and cannot get or maintain an erection because you really fuck with your brains and not your genitals, which are really just the delivery systems. Sex therapists can sometimes give you means of unblocking your mind, allowing you to have sex freely without "performance anxiety". The g spot is directly opposite the clitoris on the underside of the pubic bone (the upper side of the vagina). It is a raised mound smaller than half of your little finger in the 12 o'clock position inside your vagina, which becomes more raised when you are aroused. There has to be constant communication between the partners as to when the g spot has been hit, and when the fingers have strayed from it. Take a few hits, or a few drinks to get you relaxed, and then try it. You may be surprised at what you feel. As I said, my current girlfriend never got a g spot orgasm until she met me, The G Spot Master.
one quick note. yes, it's so so important for you to be able to get off yourself without a man, so you know what you like. but also, it might just be that you two don't work sexually. i was in a four year relationship with one guy, and never once had an orgasm. i'm in a different relationship now that i've been in for just over a year and i have one every single time.