Me being only 16 years old, I am still in high school (Catholic High School) and a man by the name of Jason Evret came to speak on the subject of virginity, celibacy, and sexuality. According to him, the first time is sometimes either a mistake or an adventure. He says that it is possible to become celibate even if your not a virgin, and sometimes it's a great idea to do so. Evret also claimed that if your partner disagrees with you and wants to stay sexually active, that there may be something wrong with your relationship.
Anyways, thats just my two cents; good luck.