What happen to you was truly awful, and you did not deserve it. Above all it was not your fault at all, you do not have to bear any shame, but yet that is the way you feel.
I would not be surprised if you also feel anger, and depression, and other negative feelings. As the victim you have the right to have all these and other feelings.
Please do tell your therapist, he/she should be able to unravel what happened, help you grieve, and then find a way to reclaim yourself.
OO