Dear Virneto,
Having been married 29 years, believe me, the final satisfaction derived from intercourse is going to vary each time. I guess I've been at it for so long that I've learned to have no expectations. But admittedly what keeps me coming back is that it is sometimes very, very good. Your girlfriend sounds very sweet. If she's not reaching orgasm, there are other ways to please her erotically. Admittedly, achieving orgasm through penetration is very nice but so are other things. When a man is concerned about a woman's pleasure--that is very, very sexy! Hopefully, the more you are with your girlfriend, the more relaxed you will become.