How does the author show us that Ralph is finally beginning to face the realities of their existence?

He is lost in thought and incredibly frustrated with how the boys act.

Chapter Five: Beast From Water

Ralph goes to the beach because he needs a place to think and feels overcome with frustration and impotence. He is saddened by his own physical appearance, which has grown shabby with neglect. In particular, his hair has grown uncomfortably long. He understands the weariness of life, where everything requires improvisation. Ralph decides to call a meeting near the bathing pool, realizing that he must think and must make a decision but that he lacks Piggy's natural intellectual ability.