I took advantage of a drunk girl?

Last night i went to a birthday of a girl im good friend with. It was being realy good and i meet one of her friends that i had never seen before and we started talking, and flirting (her name was stacey). Everyone was having a realy good time and we all started to drink. After the dinner we all went to a club and thats went started to get messy. See, stacy was realy drunk and she was dancing with me, i wasnt drunk but i still couldnt resiste her, so i started to kiss her, and she didnt stop me. Then i was realy turned on, we were making out, and i wanted to have sex with her realy badly, so i lead her to the bathroom (she was realy drunk but i mean cmon she was so hot). But my friend (the birthday girl) saw us and she got realy pissed at me, because stacey was one of her bestfriends and i was taking advantage of her. She told me stacey was a virgin and that i was being a perve... i felt realy bad because i had no idea, and i cant stop thinking about what i did, seriously, if it hadnt been her trying to stop me, i would probaly take a drunk girls virginty... Whats wrong with me?