One of the reasons we tend to worry is that life can quickly get out of control.  Someone you care about, someone you love, isn't listening, isn't responding, or just doesn't get it.  Say, for example, you are responsible for someone or something, and your best effort isn't enough.  You can't walk away from the situation.  Quitting isn't an option.  It may be a teen, an aged parent who depends on you for help, or a family business which seems to be going the wrong way.