Do you live alone? Or do you have a spouse? Children? If you have other JW's in your household, it's more complicated.
If you're single and free, it might be a good idea to move to another town or another state.
At least, you can have your phone number changed - AND unlisted.
Avoidance is easier than confrontation.
If they knock on your door, go to the door with an ice pack on your head and tell them you have a migraine, and that migraines have become persistent and are crippling you at this point, and that you're not up to talking.
As others have said, you do not owe them an explanation. There is no reason to feel guilty unless you believe you're doing something wrong, and you are NOT. You do owe yourself the best life you can make.
All actions have consequences. If you're not ready for the consequences, maybe you're not quite ready to leave yet. But keep fading. There's no rush unless you're entirely fed up and can't take it anymore.
Best wishes for a happy future!