Feel worthless

Well it's hard to know where to start this, I feel l like I've had this pain slowly building up my gut, and it's finally reached a boiling point. I've been with the most beautiful girl for 2.5 years, honestly I love her so much - I've never had more fun with a person in my life, but I just don't know how much longer I can take feeling this way. She thinks I'm a hugely sexual person, which is half true (that said, my libido isn't as high as girlfriends I've had in the past, if fact before her and I went out I was taking medication for Erectile Dysfunction, so it can't be that out of hand!) If it wasn't for me I honestly feel like we would just never have sex. She thinks I just want sex, but what I want more than anything is to feel wanted. I'm constantly telling her how beautiful she is, she never calls me handsome, complements me, she'll only say something nice if I'm self-depreciating. It does my head in. In the 2.5 years we've been together she's initiated sex ONCE, and even that was pretty borderline, but that said it's probably MY FAVORITE SEXUAL MEMORY OF OUR WHOLE RELATIONSHIP. Why? because it was the only time I didn't feel like I was pleading to have sex with her. I'd say I have sex with her twice a month, and even then it feels like she''s just doing it out of a sense of obligation, the proof is that she'll NEVER accept my advances during the day, she even physically holds me at an arms length away, and get's upset if I suggest we go to the bedroom, acting like I've suggested something really ridiculous, it makes me feel so worthless. The only time we'll have sex is at night, but like i said, I can tell she feels obliged. But the crazy thing is when we do have sex, I KNOW SHE'S INTO IT! She get's off on Erotic Asphyxiation, and this 50 k.g. girl can take more punishment than this 6'3 rugby player could ever hope to withstand. I'm always asking her if there's anything I can do better/change, I always give her a good 20 minutes+ of foreplay/head before we have sex. I'm getting a little off topic, but I think a problem is she really doesn't know her body. She never masturbates, didn't like the vibrator I bought her, has a stable diet of Red Bull, Carrots and Apples (she's seriously anemic which her family bury their heads in the sand about) and is just generally tired and worn out (she works a lot, in her defense). I just don't know what to do, any advice would be appreciated. Especially from the ladies. Any questions, ask away! Thanks!

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