Sex is so different with us...:(

Hi ladies! Firstly ill come out and say I'm overweight, I'm working on shedding it but geez my sex life has sucked the past year. Because of my size, I can't really do the typical moves you would do to take control. There's one, but I need to change it up!! My legs are too short to where when I sit back on him, I can't go up and down, any help would be appreciated and maybe tried and true positions that work for the less in shape chic.

P.S. I've tried squatting, lasts like 20 seconds and then my legs are collapsing...currently working on building muscle.