Whatever. Are you here to give flack or seek advice? Think about that for a few minutes before firing back a bunch of bullshit. I strongly suggest that you and your girl go visit an MD. It may mean nothing, and it could mean a lot.
Shes probably just selfish. Make her get you off at least once before you give it to her. If she refuses then you know shes just thinking about herself.
The feminist in me notes that the problem you are describing sounds uncomfortably like man women's feelings about their men. No foreplay, no interest in your pleasure, quick ending, then snore and ignore? She sounds like a stereotypical man with a vagina. Tasteless snarking aside, though, it does sound as if she's faking her orgasms. Unless you can physically feel the muscles constricting, you don't really know. I'd be a tease, with much foreplay and refusing penetration until you're good and ready.
There's a difference. One can be feminist without being sexist. I was making fun of the stereotype, not the OP. My husband's with me here, and he agrees with me, though. She's most likely faking her orgasms as an excuse to be left alone.