Likewise, it is crazy to me when I realised how thin our oceans are. I used to think of them as super deep (I mean, they are) but even the Mariana trench is a mere 0.2% of the Earth's radius. Average ocean depth is more like 0.05%.
If you inflate a 18cm diameter head to the size of our planet, a 75um hair would be about 5km wide - which is about the average depth of our oceans.
It's one hair, not a whole head of hair!
On the planetary scale, humans are tiny. We're more or less equivalent to bacteria.
Our entire civilisation is a skin rash.