Call 911, a friend, campus security, BSU crisis line or an area rape crisis center. Call a friend to stay with you while you go through your next steps. Even if you haven't decided whether or not to go to the police, you should take steps to preserve evidence in case you do need it. Go to an emergency room where you can be examined for injury and disease and medical evidence can be collected. These thoughts are your choice and you should stick to them.
Abstinence can also mean waiting to choose the right person, time and place to have sex.
A decision to abstain may be for an evening or for years, or any time in-between. Abstinence can means total abstinence from sexual intercourse, but hugging and kissing are okay. Abstinence could even include some intimate caresses. It might allow for everything except sexual intercourse. Any of these are healthy choices.