Here is some background info first, we are both in our mid 20's and have been together for 6 months in a long distance relationship. We get on very well together apart from the bedroom, as my girlfriend doesn't really seem to be interested in sex at all.
Not to brag but just to avoid any wrong assumptions, I have been in sexual relationsihps with over 15 girls and never had a problem with pleasing them. All girls are different of course but usually there is always something one likes.
So basically my girlfriend is not interested in having sex at all. She still does it because I want it, but personally she isn't interested. I have been able to make her orgasm a few times through oral, but this doesn't seem like a big deal to her at all (as in she wouldn't care if I never did it).
Every time we are about to have sex she says something like "not tonight, ok?" or "don't touch me" jokingly. This has completely taken everything passionate away about our sex so I've actually started thinking of other girls while we have sex.. it feels like I'm only using her as a masturbation device.
I always try do do a long foreplay, but the thing is she doesn't enjoy anything like me touching or kissing her body either. She doesn't like anything except cuddling in bed before falling asleep.. I would do anything she likes and I've talked to her to try and find out what would she like, but the answer is usually "no".
I can sometimes get her to pleasure me, e.g. blowjob or handjob, but she usually turns me off pretty bad by always saying something before like "i hate you" or something because she's not interested in doing it. This kinda makes me wonder, that does she even have feelings for me? Because I would do things to my partner simply to see her like something, not just sex. The fact that I do something that causes happiness in her makes me happy too, but it doesn't to be the case with her.
Otherwise, she seems to like me: she has introduced me to all her friends and family, wants to spend a lot of time with me and speaks to me every day.
What should I do? I feel like this isn't working out at all. Sex where only one person enjoys it feels very empty - but it is not her fault of course, if she simply isn't interested.