Who said "I believe in myself, even if no one else does."?

This quote is attributed to Charlie Brown.

I believe in myself, even if no one else does. - Charlie Brown

"I believe in myself, even if no one else does."

Charlie Brown Courage

"Good grief!"

"I got a rock."

"Rats! I did it again."

"Why is it that everything I do turns into a disaster?"

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."