Welcome to the group.

Most of us have come to the realization that we left cause not all was right, take sometime to read some of the stories in this forum and you will see what i mean. The moment you do, you will realize why they are so afraid we would read all these real life experiences.

About them being organized i can only say that they have to be, If they were not organized, they wouldn't be able to manage so many people, run bethels, conventions, memorials, etc However, not all organize things are pure or right or just. ? Look at the Nazi regime, no one was more organized than they were. Not that i would compare the witnesses to them.

My advice to you, is that if you want to stop feeling guilty and be able to move on with your life, and all the crap you will be going through as a result of your decision, you need to stop putting them in a pedestal. For the simple reason that if you do, it makes them right and makes you wrong. The guilt you feel would never go away, and you will never feel in total charge of your life until you let go of all the brainwashing and you accept yourself . The last thing you want to do is go on doubting yourself all the time.

I left 2 years ago and even though i have no regrets in doing so. I still have to endure like almost everyone here...the rejection from my parents, the cold shoulder and the disfellowshiped treatment i get from all, including those who called themselves my friends. I am glad that i am finally in the process of starting a new life, i am starting to get out there and trying to make unconditional friends ("worldly friends") lol lol.
About the letter, make it simple say you want out and not to be contacted. But as a warning to you, sending the letter will make things harder with your parents. Although it avoids them coming to your house telling you how bad you are for not going to the meetings. My advice to you is just leave, stop going. But if anyone else has more feedback go head. I for one just left, they figure out i want nothing more.

Hang in there....be strong. There are a lot of people here that have left for many reasons, but they all end with wanting a better, brighter brand new future. We all talk about the impact of leaving has cause in our daily lives. You will find support here