Because I'm not here

Got my bullet,
Got my gun.
The equation is as easy,
As one plus one.

Load the chamber.
Cock the gun.
Now this is where,
It really gets fun.

Pull the trigger.
BANG.
There goes it all.
Now you're scrubbing,
My blood off the wall.

Ain't it funny?
Ain't it sick?
Oh, this isn't what you expected?
You f**king idiot.

Didn't see it coming.
Ha, now I'm gone.
Don't blame yourself,
Not like you did anything wrong.

Now they're lowering my casket,
Into the ground.
People are crying.
Tears all around.

Didn't notice me in the beginning.
Now why do you care?
Oh, I forgot,
It's because I'm not here.