What Is It? Poem by Slim Jim

I'ts what we do, it's what we know
I'ts what we know, that we don't show
I'ts who we are, it's what we fear
I'ts what we listen to, and still don't hear
I'ts always there, but never seen
I'ts always hidden, deep in between
I'ts the voice, we continue to use
I'ts on the sidewalk, stuck to your shoes
I'ts in the air, it's on the ground
I'ts always lost, and never found
It is thick or, it is thin?
It is somewhere you have been
I'ts not right, it's not wrong
But it's not something that doesn't belong
is it big, or is it small,
Or is it even, there at all?
If it's there, than you would know
Unless it desides, NOT to show
So is it here, or is it there
For all we know it's everywhere.