My being fears only one thing: the unknown.
I know nothing about what is not known. From the unknown, anything can come: happiness, thrills, death, boredom, grief, hype, anger... I cannot obtain knowledge on whatever is unknown without experiencing it, meaning it is unfeasible for me to be ready for it, whatever it may be.
The urge for preparation serves as the main driver of this fear. However, it is also a blessing in disguise: wanting to be ready for anything and everything allows me to develop my person at a faster pace and while that is an unreachable goal, so is perfection. The unknown is the main driver of a human's life.