Butt Implants

I have this condition that has been bugging me for years. Given that I am thin and not gifted with a healthy bun-bun, every time I sit on a chair I always feel sore on my butt. Maybe, it cannot support my upper weight and it has no enough muscle tissue to cushion the weight.

It made me curious if liposuction and breast implants are possible, are there operations with my case? And if operation is not needed, are there exercise regimens that can increase my butt muscle mass?