I've got this song stuck in my head...

Heard this song somewhere along the line today, and I've got this bit stuck in my head. It goes:

"It's just one of those days
where you want to sit down and cry,
lie down and die,
tell the world to fuck off
without a smile to hide behind.

It's just one of those days
where you want to put your life to an end
and then sit down and grin
'cause you can't answer to no one
and no one will know..."

I can't remember the rest. -_- None of my usual song-search engines are turning anything up. Rawr... Does anyone know what song this is or who sings it? For some reason I really like this song right now...