Fear is never reasonless, purposeless, or messageless. It tells you of your insecurities. It tells you of your vulnerabilities. It tells you where you are not real.
If you do not listen to fear, you will keep assuming that you are all solid and strong. It is only fear that would drive a little humility into you. Otherwise, you can license yourself to keep feeling like a superman. It is only when the superman starts shivering that you come to know that he is not so super after all.