Self-doubt goes hand in hand with the fear of failure. They are literally best buddies, always ready to support each other. But the good news is that you can manage and reduce them both at a time. And to do that, you need to take action. Action is the remedy for the fear of failure and self-doubt. You need to prove to yourself (and others) that you can achieve your goals and the only way to do that is to take intentional action.