Why should I be afraid of something that I can't control? Unless mind uploading suddenly becomes feasible within my lifespan, which is extremely doubtful, there will be a time in which I die, and it will be permanent. I'm okay with that because I can't do anything about it.
If anything, I can understand a fear of dying—that is, the specific circumstances of one's death. I'm 17 right now, and I could feasibly expect another sixty or seventy years, but it's also possible something could happen to me within seconds of posting this. One never knows when they will go.
Roger Ebert wrote really eloquently on death and its inevitability, with the kind of perspective that could only come to someone like him, who had had several extremely close calls in the last decade of his life. I've always been fascinated by this passage: