I want to become more assertive and confident in the sack!

My husband and I were just married this May, but together 11 years. We have great sex, he is always getting us fun toys to try and I'm always open to trying whatever-I feel like we have tried most things. The problem I have is that I want to become more assertive and confident. I don't know how. I have gained a little weight since we started dating so many years ago and feel self conscious. He is always telling me how sexy I am and how attracted he is to me (probably because he knows I am not happy with my body right now-Im working on it but new pregnancy is putting it on the back burner). I just want to blow his mind a little. Any suggestions?