TeenHealthFX strongly encourages you to be examined by a doctor - sex isn't supposed to hurt, it is supposed to be pleasurable. Your doctor will be able to evaluate the situation and let you know if any treatment is needed. In any case you'll feel much better once you know what is going on.
If you don't have your own doctor and you live in Northern New Jersey you can contact the Adolescent Young Adult Center for Health at (973) 971.6475. Outside of this area you can go to a teen health clinic or local Planned Parenthood. They can see you without your parent's permission and on a low/no cost basis.
Last but not least, be sure to communicate your situation to your partner. Sex can be very fulfilling and pleasurable - both emotionally and physically. Just remember that an important part of having a positive experience is having a loving and supportive partner with whom you can communicate openly.