Whilst it is indeed his fault, part of me does believe that it may not have happened if I wasn't so drunk....
Yes, well it also wouldn't have happened if you spent your entire life locked in a convent, if you had never been born or if you were a chicken. It's not your responsibility to live a half life dictated by what other people might do to you. It is absolutely 100% your rapist's fault. It is not yours, not one iota, not a jot.
Hugs to you. I hope you have the help and support you need to recover, and that you learn never, ever, ever to blame yourself one tiny bit for the actions of that criminal.