why do females worry about breast size?

It's not always about what guys think.

Speak for yourself Kyle1991. Cleavage on the right, left bewb in the middle, one hung on the left like a bomb and like a board on the right. And then there's this enormity I wouldn't even know what to do with.

I don't care about them, but i assume it's because most men make a big deal about them and have set an idea of what is considered attractive