The piece missing from every puzzle

And when found 

I don't fit

Some will try hard

To press their thumbs 

Jamming me in and out of every corner

Where I was not made to be

So many pieces,

Scattered

All in different shapes and quantities 

But none,

able to

Connect to me

Eventually they all give up

And the mystery remains unsolved

Oh, where could the other half be? 

Not picture perfect

Never complete

All because of me