Prove Yourself lyrics - Radiohead

I can't afford to breathe in this time
Nowhere to sit without a gun in my hand
Hooked back up to the cathode ray
I'm better off dead
I'm better off dead
I'm better off

Prove yourself
Prove yourself
Prove yourself

I wanna breathe, I wanna grow
I'd say I want it but I don't know how
I work, I bleed, I beg and I pray
But I'm better off dead
I'm better off dead
I'm better off

Prove yourself
Prove yourself
Prove yourself

Why?