I'm not afraid of THE future, but sometimes I'm afraid about MY future.
I like the future in terms of new technology. I love new inventions, new discoveries, and simply the news itself. When someone asks the parlor game question: "If you could look back, what will you miss most when you die?" my answer is "Tomorrow's headlines."
Which brings me to what I fear most about my own future - death. I don't think there will be a looking back like in the question, but that's how most of us imagine it, because what is hardest to imagine is black nothingness, no more thoughts, no anything. But that's what I believe it will be.
When I was much younger I did get a little anxious wondering what my future would be, if it would be anything interesting & worthwhile. I most feared a boring 9-to-5 job, every day like the one before it, and the next one the same as today. The Army definitely took care of that problem for me. But unfortunately that career didn't provide me with the money I also wanted to have, and so my fear of living with limited means did come true.