I find it a turn on to physically hurt my boyfriend???

We're really close and he's so loyal and sweet and chill. He loves me as much as I love him. But I've noticed that I have a lot of kinks/turn ons in our relationship and one I've noticed is that I like to hurt him physically, and then quickly apologize and comfort him. He doesn't get mad at me for it and I think it's because he can tell that it's my kink. He doesn't treat me like that. He treats me with so much care and love. Then I'm over here being aggressive at times. I'm loving and caring towards him too it's just I have a little more agression. Is this okay? Will it ruin our relationship in the future? Is it normal? I sometimes have images of him getting hurt and it turns me on. I don't feel bad for it either only a little. Can I fix this?