What should I think?

I'm 16, and I was with a few friends the other night and we were having a fun summer night, we'll we were drinking and all my friends there were 18 plus, no we are not of age to be drinking but this could happen to anyone, so what happened was I got drunk. Black out drunk and my friends went to bed and there was a guy there who I met 2 times, he's 18 and I woke up next to him with no pants or underwear on. I grabbed my things and went to the bathroom and cried, it was not my first time but it scares me that I do not remember a single thing of what happened with us and all he said was oh yeah we had sex. I just don't know what to think or what happened, or what you ladies think of the situation. I'm just looking for advice or anything on this topic.