I'd like to address your feelings of guilt and unworthiness. Better get used to them.
I think most all here would agree that guilt comes with being a witness. The standard we are to reach for is simply unattainable, therefore we feel unacceptable by Jehovah.
If we can't make the national average of preaching hours, we feel guilty. If we make the national average but can't pioneer, we feel guilty. If we auxillary pioneer but can't regular pioneer, we feel guilty, and on and on. If we miss a meeting, or even wish we could miss a meeting, we feel guilty. We are always told to give more, more. This is a perfect recipe for guilt and unworthiness.
This is the problem of religions that base salvation on works. Since humans are by nature imperfect, there is no way we can ever earn Jehovah's favor. Not even the most pious, God-fearing member of the Governing Body is acceptable to him. What did Jesus die for if all we have to do is be good and do what the Society says to gain everlasting life. I suggest you read about salvation through grace.
I know I lived with the terrible guilt for 30 years. Now, for the first time in my life, I'm free of it, and it makes all the difference in the world. I've never walked without the heavy weight of the witness burden until now. I've found that worshipping can be a pleasure and not a millstone.
I hope you can find peace at the end of your struggle.
Penny