You used me over and over til you used me up

I want you so bad, I'm shaking
You're like a needle underneath my skin
I won't let my hunger for you pull me back again
Wrapped up in you, I lost myself
Couldn't see how I needed some help
Guess the fear of leaving made me stay

I'm so sick of trying, praying that you'll change
I'm walking the line between pleasure and pain
I've got nothing left
I gave all of me
Hurt so bad, I can barely breathe
Gotta save me from my addiction.