How does Ralph’s waning confidence in himself show in his words and actions?

In the story the Lord of the Flies, Ralph, being one of the oldest, acts as the leader in his group. While the other boys like to avoid work, just want to have fun, and play, he wants to build huts at their tribe. Though he is a responsible and industrious member of his tribe, Ralph tends to lose his confidence too. It shows in one part of the story where he is having a speech and loses his concentration.

He started twisting his hands, biting his nails, and shuddering to show that he is being anxious. It just only shows that even brave people have also fears and weaknesses but they will still confront it.