How to be a bottom?

Here some background history about me before I start. I only been bottom about 2 or 3 times. 2 small dicks and 1 huge dick. But they were all Craigslist/grinder hookup. I been to bathhouses before I'm,Houston and I like it but it seems like people only want to give me BJ and want me to be top. I kind of shy and all I really do is leave the door open laying down. When someone stops I shake my ass a little. They ether walk away or flip me over and suck me. Most of the guys that do the same as me have small dicks and I want at least 5 inches in me. Anyone got any advice on how to flirt or anything? And maybe some gay club advice too? Thank you