Everyone in this world has always a fear. Fear can be of heights, water, fire, even human beings but its not compulsory to have a fear from any form. Sometimes people even hold up some fear of unknown (something thats they’re unaware of). Which ultimately hinders there progress somewhere in their lifes.
Friends don’t try to fight it back because you don’t know its origin. Just leave it. Leave it and conquer it by doing great things which helps you to grow. One day automatically it will go off.