When you are in deep sleep, a snake may glide close to you, but you are not afraid of it because you are not thinking about the snake. On the other hand, when you are awake, the sight of even a coiled piece of rope can fill you with fear, because you think that the coiled rope is a snake.
If you are uncertain of your future, don’t formulate your uncertainties in a language and represent them in your mind. If you do, you will be afraid of your future. If you stop that kind of interpretation, your fears will cease.
Fear also arises from a threat perceived in immediate physical surroundings. For example, you may be in a jungle that you know has tigers. You will genuinely be scared. Even then, you can turn that fear into an enjoyable experience, what advertisers of adventure sports call an ‘adrenaline-pumping‘ experience.
If you have a fear, first understand the nature of the object that arouses it. Let us say you are afraid of your future. What you really fear is the uncertainty that surrounds events yet to happen. By living in the present and proper planning, you can reduce the uncertainty and, hence, your fear. Learn the art of enjoying it too.