Sex hurts no matter what...

Sex hurts me no matter what position I try. I don't want to hurt my boyfriends feelings but last night it was BRUTAL. I thought I was going to cry. I told him it hurt and he tried slowing down but it still hurt. I told him so he stopped, but I want to enjoy sex. I'm 5'0 and about 78 pounds.im 19. And I've had sex with 3 people and it hurts everytime. My boyfriends dick isn't huge about 6 inches. But it hurts when he inserts it fully and bangs up against me, inside. Any tips or tricks?