We don't belong here.

[WinterHold]

To live on earth, humans must adapt to it.
We literally have nothing natural that allow us to naturally survive the conditions of earth.

That's untrue. We are simply unsuited to life outside of the tropical regions in which we evolved. We have spread beyond those regions because we can adapt, wear skins, make baseboard heaters, etc...

Having "nothing natural to survive earth" does not refer to "earth itself"; it refers to "ourselves".
In other words; you have no natural mechanism in your own body that ensures the production of food, drink and air.

You need the O2 from earth's atmoshphere.
You need the water from earth's surface/underground.
You need the food from creatures that already live on earth.