Does anybody else feel like it's kind of their fault?

Caitlyn • Rainbow baby boy born 8-7-20
This may be a TMI post for some. Graphic and detailed 
I was 17 and I was at a party. I had been drinking and had taken some drugs (mostly downers).
My "friend" told me about this guy that wanted to get with me .
I agreed to talk to the guy. We didn't talk in private, but it was in a bedroom. There was like four other people (men) in the room.
I don't really remember what happened to get to that point, but I do remember he stuck his penis in my mouth and moved my head back and forth so I'd suck it. Then, he got on top and did some business.  Somehow it moved to anal. It hurt so bad. It felt like glass shards.
I remember not even trying to fight. I remember just letting him do what he wanted to do. I did say that I didn't want to, but i didn't do much else.
I remember he only quit because he got mad that some poop ended up on him. 
I remember just laying there, naked, exposed, in front of those other men who just sat there and watched, and did nothing to help me. They just picked up their beers and left the room after
I feel like, somehow, if it hadn't taken the downers, I would've been able to fight back. That I would've been able to do something about it. If I didn't have all those drugs in my system, my natural reactions would've kicked in. 
Does anybody else feel like it's partly their fault? I'm 21 now and still worry that it's my fault