“And the salt in my wounds,
Isn't burning anymore than it used to.
It's not that I don't feel the pain,
It's just I'm not afraid of hurting anymore”

Paramore – Last Hope Lyrics on LyricsMode
EXPLANATION
She's been hurt so many times, she's not afraid of anything else that may come and hurt her, and there fore the pain isn't as great. She still feels the pain, however not in the usual pain format (burning) - she just know's she's had it the worst, and it can't get any worse than what its already been.