Treatment may include testing for sexually transmitted diseases, medication to prevent pregnancy, and documenting evidence of rape so you can decide later whether to prosecute. Report the rape. It is your decision whether to report the rape to police and then to press charges, but you are strongly encouraged to do so as soon as possible. You should not be ashamed. A crime was perpetrated against you- you are not at fault.
Acquaintance rape is a crime.
Whether or not you report the rape or prosecute, you should consult a trained counselor for help in dealing with the emotional aftermath of rape. Counselors will also be willing to help others who are close to you.