Why does mitty daydream so much

Walter Mitty hates his dreary life. His wife is a scold and he tires of the routine tasks he is forced to do everyday. He escapes into his daydreams as a refuge from his reality.

Walter Mitty daydreams to escapes his own reality. In his daydreams walter is a hero, while in reality he is humiliated by his wife and other characters that scold him for his daydreams