Worry refers to the thoughts, images and emotions of a negative nature in which mental attempts are made to avoid anticipated potential threats. Some of those threats are real, most of those are imaginary. Some of those threats are physical, but most of them threaten the persona, the person you want to be perceived as... so it threatens your self-image.
The most important part of worry is that there is no action. There is no action anywhere. It is all an inside fretting that is wholly impotent: it doesn't prevent anything, it doesn't change anything: stupid.
When someone realizes that worry is stupid and an effective way to avoid effective action that actually would make a difference, some may stop worrying, most will continue.
Effective action in the present moment is what we are after.
Sometimes an effective action is to figure out what to do, write it down, put it in your calendar, and do it when the calendar comes to that time.