I don't know why I'm here

I'm having one of those days whereby I am clueless as to the reason for my existence and inert as I have no idea what my function is or should be.

Seriously, I breathe, take up space, leave an impression within the cushion of my chair yet that is all. Ambition is gone along with "what the hell should I be doing with myself". 

Thus I sit. I breathe. I exist. Without knowing the reason.