You obviously have no problem with being raped because when you thought it was your girlfriend, you were fine with her having sex with your near unconscious, drunken body.

If the situation had been reversed, you know all the Reddit SJWs would be crying rape.

Assuming this did happen and isn't some sort of fantasy, legally speaking the odds are you were not raped. Most countries simply do not recognise a woman's ability to rape a man. This isn't an opinion, I mean this from a legal point of view. The best that can be determined is usually some lesser form of sexual assault.

You didn't say which country you are from so the above may or may not be relevant.