Help!

I've had a song stuck in my head and I have no clue where I heard it or what it is. I think the lyrics go something like:
Vanity,
Nothing I do does a thing for me,
Can this be?
I am the worst thing thats ever happened to me.

Anyone know who it's by or the name of it? Thanks!

Try Sleater-Kinney's "Living In Exile"

Once I had all, had everything
the real princess, the ruling queen.
I walked with arrogance, with vanity
but I made sure my heart
they wouldn't see.

One day I woke up it was gone
the castle kingdom all were lost.
Now I have nothing left,
nowhere to go.
And my heart that's full of doubt
is all I've left to show.

She is living in exile.

I'll walk 3,000 lonely miles.
I'll start a new life on my own.
Don't know what I'm waiting for,
but when it comes,
You know I'll be ready
a new woman.

I know my head is my worst enemy
Swallowed too much of it and started to believe
I know my heart is my worst enemy
Swallowed too much of it and started to believe