Bronee,
I am working through the same issus. I used sex as a weapon in my old days, because I thought that was the only way I man could like me. I was in a relationship where he wanted sex much more than I did and I just did it because I felt like it was my obligation as a woman. I was his "vessel". That's how it felt.
I've made a rule for myself out of all of this. I won't sleep with a guy from the start now. I used to. I'd sleep with him and then he'd like me and we'd have a relationship. I've decided now that the next guy I date will have to wait for sex until I know he's in it for more than that.
Its not weird to feel this way at all. In fact, all my girlfriends have felt the same way at some point in their lives.