this is a terrible situation to be in, i am really sorry.
it is awful feeling as low as you do, but there is only one way now, and that is up.
what you really need to do is find someone who you can confide this in.
if you feel embarassed then write what you are feeling in a letter and give that to someone. sometimes letters also provide you with a way of figuring things out for yourself; once you have written it, read it over and you can start to understand your feelings, which i am sure will be very mixed up.
after you have told someone, they may try to convince you to go to the police. now, that may seem a really big, scary thing to do so, if you are not up to that at this very moment, don't do it. all of the DNA evidence would be gone now anyway so all they would be able to get from you is a statement and they can get that at any time. on saying this, once the statement part is out of the way, you can start the healing process.
getting over all that you feel will take a very long time. perhaps taking a year out from uni would help you get yourself sorted.
but please, tell someone. otherwise, this horrible cycle will keep turning and you'll find it really hard to break it.
well done on being able to write this thread, that's a really impressive step towards accepting what happened, and hopefull you will be filled with a little bit of courage to tell someone.
let us know how you get on
xxx