only can orgasim during masterbation

I have been masetrbating since around 8 y/o and now I am 24, I usually masterbate lying on my stomach with a sheet or towel rubbing my clitoris and anus usually looking at internet porn. my problem is, I have never really had a orgasm that even seems half or even close to what i experience when I masterbate, this has been a problem for me when my partner feels that it is his fault for me not getting off, I still cum and feel similar to having a orgasm, but nothing even close to when i do it myself. Oh yeah and it has to be a certain way, fingers don't do it for me, should I quit masterbating and hope that i can find a g-spot?

It sounds like your are the same as my wife. She has trouble climaxing during intercourse. This is not unusual at all. Many if not most women need direct clitoral contact to orgasm. Masturbation will not "break" you are cause any harm. It is an old myth that women who masturbate can't orgasm with a man. I have found that it is really the opposite. A woman that knows how to please herself and is comfortable with her own body will enjoy sex far more.

My wife never used to masturbate and I don't think she has ever had an orgasm without direct clitoral stimulation. What works well for us is the doggie position. She will hold her self up with one arm and rub her clit with the other while I am in her from behind. The direct clitoral stimulation combined with penetration seems to work great. We also do a lot of oral sex. I would experiment with your man and see what works. But don't worry about needing direct stimulation. You situation is very normal.