Why do the closet doors in the bedroom make Bud nervous bud not buddy?

In "Bud, Not Buddy," the closet doors make Bud nervous because they symbolize his fear of abandonment and uncertainty. As a child in foster care, he has experienced instability and loss, leading him to associate closed doors with danger or rejection. The fear of what might be hidden behind those doors reflects his anxiety about his past and the unknowns of his future. This tension highlights Bud's struggle for safety and belonging throughout the story.