I have a bony butt? When I sit and bend over my sit bones stick out. It's very embarrassing and sometimes painful (Photo)

I know that only a boyfriend would see this but that’s kind of the point. When I bend over two pointy bones stick out of my butt. And when I sit down it always leaves a mark on a cushion. I’ve started working out but I worry that when I bend over they will still stick out as it feels like my main glute muscles don’t even cover over the bone. I’ve thought about BBL but I'm extremely under weight and would hate to waste 10k. I’m 5’6 and 115-110 pounds.