i’m too short

me and my bf have had shower sex twice now in a public shower because it was the only place we could have privacy etc. we have to do it standing up but i have such a hard time getting in a good position because i’m literally too short. i can only stand on my tip toes for so long before my feet start to hurt, and doggy style is just an awkward position for us both because of the height difference and it also doesn’t really hit the spot. the only thing that works is if i put my leg up a little bit. i feel like it would be so much better if he picked me up and pushed me up against the wall but i have no idea how to initiate that, he’s not very strong and idk how long he would be able to hold me up for. any suggestions??????