It does. When your acceleration changes you feel it and if you don't you might get sick. If your acceleration is static there are no additional forces on you

Car sickness is very real though, only maybe not as much for the driver.

I never used to have it, but in modern cars where accelerations are much higher and you're much more disconnected from the outside in terms of how much you can see and hear, it's almost a certainty. This is especially true on the backseat where it can also get fairly claustrophobic.

For many people it does. However for most it does Not because you aren’t standing still. You’re actually moving.

Because in real life you do feel the effects of bends in the road, acceleration, breaking, and the terrain under your wheels.

You feel the acceleration and braking and turning when you’re in a real car.

In real life, you can feel the acceleration of the car.