Fear is nothing more than an interpretation of the facts that we have in our mind, for example, we can be afraid of an airplane without having never stepped on an airplane, just the fact of imagining a plane falling already we were apprehensive when getting into an airplane.
The curious thing about it all is that only a few times in life that we come across something really dangerous, most of the time it is imaginary. However, even though we consciously know that this fear is imaginary, it does not mean that it will save us from being afraid. 
Ever wondered what would be great artists, musicians, scientists, soccer players... if they had not faced the fear? Well, they would all be unknown, it is not so much that there is a phrase that says that fear is a prison without bars, imprisons even the most talented through their own mind.
