Fix It

I have had enough
Of things I do not know.
Sorry if that's gruff
But that's just how things go.
I used to think I knew
Enough to get me by
But now I swear it's true
That all was a lie.
So I'm just sick and tired
Of not knowing it all;
My knowledge is expired,
My mind begins to pall.
But hey, I feel this yearning
At school - so here's to learning!