You should have stopped him!
1. Sex should NEVER be painful.
2. Use lube!
3. Make him give you an orgasm before he even tries for penetration.
4. Use protection!
You might not have had a hymen to break, hun. He simply didn't care for your feelings and you didn't know any better. It's not your fault. Women have been brainwashed into thinking losing their virginity needs to be a horridly painful and bloody experience. It's just not true.
You were most likely injured during the forced sex, and that could be to your hymen or even to the vaginal walls themselves. Now that you're sexually active you need to get a pap-smear done.
Next time it hurts, COMMAND him to stop. Kick him if you need to. You are the woman, and you are in control. Sex does not need to hurt.