The root cause of a worrying is lack of clarity on what to do next.

If you want to stop worrying about the future, then figure out what it is that is keeping you worried, and then ask yourself - what can you do about?

Either you are going to have an answer, and then you won't have a reason to worry because you'll know exactly what to do net, or if the answer is that you cannot do anything, then just stop worrying about it.