Who told you to worry?
Who said you can not stop worrying?
Worry is stressful. Worry tenses the body and causes pain.
Most of the stuff you worry about never happens.
Worry puts you on the path of over thinking, panic, the downward spiral of depression. In no time at all you will be paralyzed.
As soon as you start to worry, replace the thoughts with positive gentle words. At first your mind will fight you. Soon you will see that worrying is just a habit and habits can be changed.
Worry is just fear. You are stronger than any fear.
For one day say nothing negative about yourself in your thoughts or out loud. Then try it for another day, and another and another until it becomes a habit.
Have patience, it takes time to change a negative habit into a positive habit.
You can do it. Just try.