Overreacting?

last week I was really.....intoxicated and couldn't walk home so I stayed at my "friends" house and he ended up sleeping with me and I feel really bad about it and uncomfortable because of the state I was in (we've slept together before) am I overreacting or is it actually an issue? I left that night in tears and screamed and cried in my best friends car for an hour.

edit: part of the problem is I cant even remember if I initiated anything or came onto him myself it could be my fault I just dont know