Who said "Fear is just in your head."?

This quote is attributed to Peter Griffin.

Fear is just in your head. - Peter Griffin

"Fear is just in your head."

Peter Griffin Fear

"Shut up, Meg."

"All right, all right, I'm coming, Elizabeth."

"Giggity!"

"You know what really grinds my gears?"

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."