I can't stand this

When I sit so that my feet sit flat on the floor, my legs usually don't bounce. However, I usually wind up sitting on my toes, because it raises my thighs up so that they are not pressing into the chair. When I sit like that, my legs start to bounce. I think that over time, I have gotten used to my feet not sitting flat on the floor. I'm sitting straight right now and it almost feels uncomfortable and unnatural. I have an urge to sit the other way, to sit on my toes.

I also don't sit straight like that because with the size of my butt, there is maybe 4 inches between my back and the chair back. Really, my bottom half of my body is bigger than the top, known as a pear shape. I remember as a teenager, and occasionally after that, I mother would try to get me to sit back. Because that pretty much has me leaning back, it's not comfortable. At work, when I lean back, I also put my legs up under my desk. In that position, my legs don't bounce. After awhile, change positions back to a sitting position. And it goes back and forth like that all day long.