What do you fear?

I have a fear of heights. I fear feeling empty and alone. I fear that I will lose everyone imporant to me. I'm afraid of snakes. I am terrified of small spaces. I dread never knowing what true love feels like. I feel horrified whenever insects are around me. I fear the thought of people perceiving me as a bad person. I can go on for days counting down all the fears I have. But if I had to choose biggest of them all it would be the fear of people who aren't afraid of anything. What do you fear?