Do not blame yourself. Do not distract yourself from your feelings. Process them. It is totally ok to feel despair, violated, betrayed, defeated, confused. Don't run away from it.
Find a support group. Tell your story. Accept that what happened happened and find a way to not just dwell in the moment but move forward. What do you want? Justice, prevention, to put it in your past?
Release the energy through creative outlets. Write, draw, paint, sing, dance, express yourself and those feelings.
Bottling your feelings and trying to erase the incident will only cause more harm to yourself.
Take Plan B as soon as possible (within 72 hours). Dont shower, go to the police to get a rape kit done. Plan B is available at a lower price at Planned Parenthood, they may also be able to get you on birth control at a lower price.