Who said "Do you ever feel like you're not quite good enough?"?

This quote is attributed to Snoopy.

Do you ever feel like you're not quite good enough? - Snoopy

"Do you ever feel like you're not quite good enough?"

Snoopy Fear

"I think I'm dying. Send for a doctor immediately!"

"Rats! Another day, another disappointment."

"Sometimes I lie awake at night and ask, 'Is life a multiple choice test or an essay?' Then a dog barks and I realize it doesn't matter."

"I love mankind. It's people I can't stand."

"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."