Not all mathematical objects have correspondents in the natural world.

0 it's a mathematical convention. We can't have 0 apples in a basket. We either have some apples or we don't have any.

If 0 is weird, negative numbers are also weird. Infinity is weird. Spaces with more than three dimensions are weird.

Complex numbers are weird from an algebraic perspective but not that weird from a geometric perspective.

Empty set is weird.

Everything that's abstract is weird.

For my mind abstract algebra is more weird than calculus and mathematical analysis so that's why I enjoy calculus and mathematical analysis more.

But being weird and abstract can also be useful.