Sex advise please!

Ok I'm 33. I have two girls we are trying for a third baby. I'm embarrassed to even say this. This is my second marriage. My first husband was very abusive and mean to me, especially during sex. So with that I have absolutely no confidence. So last night while trying to do the baby dance, I had a flash back of my first husband and completely froze. I felt like I was a kid again not knowing what to do. So my husband made a comment and I started to cry. He apologized which I was ok after that. But my question is what can I do where having sex with my husband doesn't make it like a chore. He is a very plan doesn't care for crazy stuff. I just want to make it interesting so it's not Boring for him, please help.