You probably have heard this before, but I'm gonna say it again. If you want your H to see you as sexy, you have to feel it yourself first. I don't get the sense that you feel you are a desirable person. (If I am wrong about this, I apologize.)
What makes someone sexy is not determined by looks alone. It is attitude and confidence. Do you turn yourself on? Maybe that's an odd and uncomfortable question, but I think it's an important one. If you don't find yourself sexy and desirable why would you expect someone else to?