Cartoonist Schulz as a boy was teased by others for being small and not very good at sports, and art. He had few friends and was too shy to talk to a red-haired girl he admired. Later in life, Schulz used his childhood experiences in his successful comic strip Peanuts: the strip's main character, the sad and lonely Charlie Brown, represents Shulz as a little boy. What is the main idea of the passage?