I also worry about my future often. I read different websites on the topic and the main answers were the future is always unknown that things will happen that you wont expect, or that you cant prevent.
It is a scary truth. It helps to try to except that the future is unknown I guess, and to not fight it. It helps me.

Reminds me of the song..

"Que sera, sera,
Whatever will be, will be;
The future's not ours to see.
Que sera, sera,
What will be, will be."