@Dosed,
Look Dosed, don't listen to this **** about it "being completely your fault" or say it to yourself.
It's great that you understand your contribution to the situation....but there were two people in the back seat of that car, and, at the very LEAST, it sounds like this guy took no thought for your condition.
Unfortunately this happens all too often and it would leave ANYONE feeling distressed and disturbed. I know because I have worked with large numbers of folk in your situation and sadly all too many people still see all responsible decisions about sex as being the responsibility of the woman. Well, here's some news....he carries responsibility too.
I think counselling is a great idea....and I'd take on board Joe's questions about your drinking, too. Lots of young women these days binge drink, and as well as it leading to putting themselves in unsafe situations, our bodies and brains are even more susceptible to alcohol problems than those of the guys.
Hon, it's a fine line this learning from a mistake vs taking an unreasonable amount of blame.
It's a tough world out there and we have to learn to take reasonable care of ourselves...please PLEASE do from now on...but you being drunk and coming onto a guy doesn't mean he has no responsibility about figuring out if you're in any state to give consent.
And best of luck to you in the future.