Here's a breakdown:
* Fear: Brian is initially terrified of being alone in the wilderness, especially after the plane crash. He fears bears, wild animals, hunger, and the vastness of the unknown.
* Self-Doubt: Brian questions his ability to survive. He doubts his skills, his knowledge, and his resilience. He grapples with the thought that he might not make it.
* Survival: He must constantly overcome his fear and self-doubt to provide for himself, build shelter, find food, and learn the basic skills of survival.
Throughout the story, Brian battles these internal conflicts as he learns to rely on himself and adapt to his environment. He ultimately uses his internal strength and resourcefulness to overcome his fears and doubts, demonstrating that even in the face of extreme adversity, the human spirit can prevail.