Why is it that when riding in a car, you don't feel like you're moving?

This may shock you:

We NEVER feel speed, velocity, or motion, as long as it's constant.

We only feel CHANGES in speed, velocity, or motion.

That means speeding up, slowing down, or changing direction.

As long as we're moving in a straight line at a constant speed, we don't feel anything.

there are no contact forces mentioned on the list of choices that you've provided.