Is Fear Our Worst Enemy ?

Fear is just like a person, it can be both our greatest benefactors or our worst enemy, depending on the time and what kind of person you are. Just like anybody, fear could help you , or betray you and stab you in the back. Fear may be a positive driving force to make you work harder, like the fear of failing a class or a fear of being punished. Fear may sometimes discourage you and paralyze you, it will prevent you from trying anything new for the fear or losing something or geting negative results. Many people lose great opportunities that way, and in that scenario fear is one of the most elusive and devastating enemy. In most scenarios  fear would prevent you form doing something, which will be your enemy, but once u get into a situation, fear would be an ally and push you towards success. Fear would serve various functions and conclude in various solutions