Unfortunately this is a HARD lesson to learn, but maybe you can walk away from this a little wiser and certainly a lot more cautious the next time. I would say that this young man isn't the " gentleman" you perceive him to be, and should stay away from him totally!!! Oh sure he's a nice guy and wouldn't hurt you????...........HE ALREADY HAS!!!
You are wrong about taking the whole responsibility on yourself, he had a part in this too. He shouldn't have taken you up to that bedroom at all!!!! PERIOD. He's not as stand up a guy as you think.
I couldn't call it rape until I knew more facts, but the fact that he told you " ya gotta do it sometime" doesn't sit well with me. You can talk to a police officer who answers sexual battery calls and see what he tells you. Get the drug test done and see for yourself if he spiked it with something. He's been waiting to do that to you since you were freshmen????? That guys a cad. Have a police officer go out and talk to him and scare the crap out of him!!
He will think twice about fooling around the next time....unless he's a blithering idiot!!!!

Do this for your own peace of mind. What he thinks is not important. What happened to you IS!!!