Why dont we feel the Earth moving?!

I was reading we move in orbit about half a million miles per hour and spin fast to how dont we feel it?

Perhaps we do. How many times have you been on an earth that wasn't spinning so that you can determine the difference?

You only know "normal" and "changes from normal".
If normal means "on the earth as it is spinning at the moment" then this is what you have learned to expect through your whole life.

It wouldn't matter if you had been born on a rotating space ship. In such a case rotating would be normal and a student there would ask "why don't we feel that our ship is rotating?"

The reason we don't feel it spinning comes down to Einstein's Theory of Relativity . In brief, we don't feel the motion of the Earth because the Earth is not accelerating. Think about being in a car. You "feel" the motion of a car when you are speeding up (accelerating) or slowing down (decelerating). When you are travelling at a constant speed, you don't "feel" like you are moving. Likewise, something dropped in a car moving at constant speed doesn't move backwards, it falls straight down just (it's motion "relative" to the car is the same as if the car was stationary). The same applies to the Earth: the planet is whizzing through space really fast, and spinning really fast, but because it isn't slowing down or speeding up, we don't "feel" it.