can someone guide me please re my rape?

please can someone help me? I am 23 years old
I met a man last year through an online dating site and it was all going very well
In Feb this year he took me to a hotel he hired outside town. I had once spoken to him about a rape fantasy I had. He had invited two of his friends to realise my fantasy. I told him it was not serious and I would never agree to this but his friend were there and all three took turns raping me. It went on for hours.
It was awful. I feel guilty was it my fault?
he told me if I tell anyone he wil just tell say I had asked for it!! I swear I didn't
I dont know what to do - please can someone help?