You think you're sitting still. You're not. Enter your latitude and find out how fast you're actually flying through space.
When you sit on a couch, you feel stationary. But that couch is on a planet that is spinning. That planet is orbiting a star. That star is orbiting the center of a galaxy. That galaxy is moving toward another galaxy. You are in motion on every scale, all the time.
At the equator, Earth's rotation carries you at 1,670 km/h. At the poles, it's zero. At your latitude, it's somewhere in between. But that's just the first layer. Earth orbits the Sun at 107,000 km/h. The Sun orbits the galactic center at 720,000 km/h. And the Milky Way itself is racing toward Andromeda at 402,000 km/h.
Add it all up and you are moving at roughly 1.1 million km/h through space. That's 300 km per second. A rifle bullet travels at about 1 km/s. You are moving 300 times faster than a bullet. And you don't feel a thing.
The reason you don't feel it is that speed is relative. You only feel acceleration, not constant velocity. Everything around you — the air, the couch, the room — is moving at the same speed. There is no "stationary" reference point in the universe. You are always moving relative to something.
Because we only feel acceleration, not constant speed. When you're in a smooth airplane at cruising altitude, you don't feel the 900 km/h. You feel takeoff and landing. The universe has no turbulence. You're moving at constant velocity through empty space, so there's nothing to feel.
Light. It travels at 1.08 billion km/h. Your 1.1 million km/h is about 0.1% of light speed. You are not moving fast at all on the cosmic scale. But you are moving faster than a bullet. That's something.
Yes, in about 4.5 billion years. The Milky Way and Andromeda are approaching each other at 402,000 km/h. When they collide, the stars are so far apart that almost none will actually hit each other. The galaxies will merge into one elliptical galaxy.
Because Earth is a sphere. At the equator, you travel the full circumference (40,075 km) in 24 hours. At higher latitudes, the circle you travel is smaller. At 45° latitude, you travel about 70% of the equatorial speed. At the poles, you just spin in place.