My concern for you is great. I want you to know that you are not responsible in any way for what happened to you and I beg you to reach out to a rav or rebbetzin and tell all that transpired. I am sure that doing us will help free you from the guilt and self-loathing you have and begin the process of rebuilding your self-worth and purpose. I can only tell you that I have counseled someone with a similar story and when a rav explained to her that Hashem was witness to her plight and her soul was clean and pure in spite of her ordeal, it opened up the avenues of healing.
Your life is a precious gift, one that you have lived admirably before this demon ripped your innocence from you. Do not allow him to take the life Hashem gave you away, as well!
From where I stand, you are guilty of nothing more than misplaced trust and youthful pride, your physical purity may have been stolen from you, but you fought to keep it. Your spiritual purity, however, is intact and unblemished. Let us help you reclaim the young woman who once laughed, loved and lived.