Being embarrassed

So me and my fiancé get intimate fairly often and I trust him and love him with everything. Often I find myself being embarrassed when I try to talk dirty and I feel dumb when I try and be sexy. He never makes me feel this way, its my own self but I want to be able to turn him on so much more by taking control and taking dirty. I want to make the change to enhance our sex life but I’m not sure how. Did anyone else experience this and if so, how’d you overcome it?