a shy 17 yr old

I was a shy 17 yr old at my sister's house party on new years eve. I found myself alone on an outside couch with one of her friends who she worked with. he was in his mid-30s and I felt pretty cool hanging out with him cause he was older. we chatted for a bit and then he mentioned he had some coke. I was pretty new to the party scene but was excited to try it out. he led me to the laundry and closed the door then leaned up against it. we had some and went back out. it was fun but a lot for me so I didn't want any more. he kept pestering me, asking if I wanted more, and I didn't want to say no so I said "not right now". I ended up saying yes. we went back to the laundry and he leaned back against the door blocking the exit. I didn't want any so I just had a little, he kept getting me more so I tried to distract him by kissing him. he was trying to undo the button of my jeans but said that the kissing was enough. he tried again and I didn't say no. so he did what he wanted then we left and I felt sick. people started to leave and I wanted to get away too. so I told my sister I was walking back to my friend's house nearby. she wouldn't let me go out alone in the dark so I was set up in the spare room. he stayed on the couch. I couldn't get to sleep from all the drugs so I just lay there. I heard the door creak open and he crept in and then into the bed I was in. I couldn't bring myself to say anything. I'm not sure how long it went on for but it seemed forever finally I spoke up and pretended I heard someone and got scared so he had to leave. I didn't get to sleep. he texted me the next day and said we should meet again. he still believes he did nothing wrong but I didn't tell him that he did.