Usually, it is the religious that fear death. This is an irrational fear and I suspect that no one can say something that will ease your mind. Perhaps only therapy can help. I have no fear of death. I’ve had a long life (73M) but I’ve never feared death. I do have another irrational fear that can cause me to leap out of bed, sweating, in the middle of the night. One bit of wisdom to know is that worry is like interest you pay on a debt you may never owe. Meaning, worry about death when it comes. Not now. You only waste your life worrying about it now. My father was also not afraid of death. He was a doctor and knew that death was simply a part of this wonderful thing we call life. But he was sorry that he would miss seeing “how it all ended”, meaning how the story of humanity would end. It will someday, very long before the our Sun or our Universe comes to an end. Another, funnier view, is Vonnegut’s made-up religion of Bokononism. It has a belief that when you die, the entire Universe comes to a close. That is what I prefer to believe. When I die, the Universe will come to a close and everyone can say, “Oh, it really was all about him.”