OP, right now you are flying at 29 kilometers per second (give or take) around the sun. You’re also going at quite a few hundreds of kilometers per hour as the earth rotates (depends on your latitude).
Yet you feel none of it because, in effect, you only feel what moves RELATIVE to you.
When you’re going a steady 60kph outside – say on a bike – what you feel is not your speed. Its the wind and the road under you that are, relative to you, at 60kph.
Inside a car, the air bubble you carry is steady. The fly therefore feels nothing. If you were going 500kph it would still feel nothing.
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