confidence boost

Hello

im a really insecure person, on body terms & how to get out of my shell more… i really would like some tips on how to become a more confident person; to be more “romantic” or “sexual” with my partner and level up our relationship. But i just seem to be so scared and shy on how to do so… what are some tips to do so ? He treats me right and makes me feel good but i find myself bland and boring. I want to boost it up. How can i do so? Thank you