I dont know what I should do need some help

This is my first time on reddit because I really don’t have anyone to talk to and I want to stay anon. A friend hosted a New Year's party at one of their relative's house, and most people got quite drunk. During the party, one of the boys approached me, and we started chatting, which led to some flirting. I tend to get attached quickly, so we ended up spending some together. Later he made a sexual advance, I wasn’t ready and rejected that specific move, he then SAed me. I’m conflicted about who to blame since we were both drunk, and I was the more attached one. Its also been hurting im scared i might be pregnant to contracted some sort of std. I havnt talked to anyone since that and barely even spoke to my parents. I feel guilty, embarrassed and comepletely miserable the whole thing and dont know how to get over this so i could really use some guidance on what to do.