One of the greatest struggles Christians deal with today is the idea that we are told we should not store up treasures on earth (Matthew 6:19-21), yet we need to have something stored up to deal with emergencies and paying bills.
Whether you are confident or self-conscience, extroverted or introverted, or really any kind of personality, you will go through hardships. Even the toughest man cries at least once in their life. So, in that moment or moments, there is a time where we revert back to a child. Not so much the immaturity (although sometimes people can act like brats when they are upset), but more of the fear of a child.