WHY are planets, satellites, and stars round while asteroids a | Why?

WHY are planets, satellites, and stars round while asteroids are not?

Small asteroids have too weak gravity to deform rocks, so objects up to a few hundred kilometers in size have an irregular shape.

The matter of a star or planet tends to be at the same distance from its own center of gravity. The reason here is the same as why the water in a pond is set at the same level, rather than rising with a hump.