Walter Mitty's Two Lives
The author's text structure defines Walter Mitty as lacking self-confidence, not having control, and as passive by using daydreams.
Lacking self-confidence
Real life- He can't doesn't think he is good enough to learn to put chains on tires.
Daydream- He is an expert doctor who save a life.
No Control
Real life- His wife tells him what to do "why don't you wear your gloves".
Daydream- He tells Lt. Berg to fly into the hurricane and he listens say Walter Mitty is the commander.
Passive
Real life- He allows his wife to tell him what to do, he says nothing.
Daydream- He punches the district attorney when accused.
Conclusion
Walter Mitty's daydreams show that he is lacking self-confidence and control as well as he is passive.