This tendency to describe a character’s emotion may reflect a lack of confidence on the part of the writer. And more often than not, writers tell their readers things already shown by dialogue and action. It’s as if they’re repeating themselves to make sure their readers get the point. So when you come across an explanation of a character’s emotion

What you must always remember is that the novel is more experiential than it is informational. Your reader might learn something, but most of what they learn is gained through what they are shown about the lives and circumstances of the characters therein.