It is related to the unknown. St. Paul was not in the least afraid of death. He said that he died daily. So to Ramana Maharshi. When we have been through the experience, it holds no more fears.
I am always upbeat, but there was a time when I read so much bad stuff about black people? based purely out of fear. Now life have moved on and many of those fears have diminished. We are also afraid of losing our jobs because naturally there are many bills to pay. Nothing is really wrong with all that I have said so far. We are all sojourners here, and it depends where we are at any given moment on the ladder of evolution, or if you like, along the road of our eternal journey.
Still, the animal in us, or the law of survival, will ensure that we remain afraid, until our own inner and outer experiences, have made us stronger. Truly speaking, there is really not much to be afraid of, but then I am sometimes just as afraid as the next person. Let us all seek to cement our relationship with the Unafraid, and all will be well.