insecure about being on top

so i want to try new positions and one that my bf wants me to try is being on top. i only just lost my virginity so i already know it'll suck. i want to have a good, fun, HOT sex life! i always fantasized about me being on top but when i tried it i felt instantly ugly. like all he could see was my face and every little flaw how do i get over that?? i want to try it whenever we have sex again but i want to be comfortable. he always tells me how beautiful i am and how he loves my body so this is stemming from myself only.