The protagonist in "On Chesil Beach" grapples with a realization about her emotional disconnection from herself and others. She questions whether her prolonged ignorance of a basic mental instinct, one that seems common to others, has led to her sense of isolation. This self-reflection brings forth a sense of longing for the immediate, genuine connections that she has been missing in her life.

Her introspection reveals a deeper struggle, as she acknowledges a detachment from both her emotions and her past. Despite the apparent normalcy that surrounds her, she feels a void stemming from her reluctance to acknowledge her needs and desires. This internal conflict highlights her journey towards self-awareness and the fear that has kept her from forming authentic relationships.