Help a plus sista out! ๐Ÿ˜‚๐Ÿ†๐Ÿ‘

Iโ€™m about 215lbs and somewhat sexually active (couple times a month) but I get self conscious when having sex about my body. Especially when it comes to me being on top! I freeze and I get anxiety and have no idea what rhythm or movement to do with my body. Iโ€™ve only had an orgasm about twice ever and it was by oral and self-masturbation during intercourse. I want to reach an orgasm while riding.. Any tips? Also I know size doesnโ€™t matter ๐Ÿ† but it always slips out.. is it because Iโ€™m not on top correctly, or too wet? PLEASE HELP I WANT TO RIDE THIS MAN LIKE CRAZY!!