The protagonist of "Prep" experiences a profound sense of isolation, particularly during social events that are meant to be enjoyable. While others engage in activities like dances and visitation, she feels acutely aware of her loneliness, as she often avoids participating and hides away instead. This highlights her struggles with belonging and friendship within a social setting that emphasizes connection and fun.

Her decision to keep her door shut during visitation contrasts sharply with the openness of her peers, symbolizing her emotional distance and the vulnerability she faces. By focusing on moments designed for enjoyment, Sittenfeld illustrates how the absence of friends can amplify feelings of exclusion, making her inner turmoil more pronounced as she attempts to navigate her teenage years in an environment where social dynamics play a crucial role.