Make yourself I was a born in. I decided I was done at 35 or so. I spent my twenties turning down great opportunities for work etc... yes 35 years of my life wasted. You are in your twenties with nothing holding you to the org. No family and you can make more friends. I lost all my family and friends on leaving... but I had respect for myself and my decisions.
I am almost at the point that I no longer feel I have any real connection to the org. I have no need to wonder if they will ring my bell. Like happy at last no one will harass me or family. I don't have to keep up with the latest news and mags. I don't have a need to rent out space in a newspaper and tell everyone else why I am mad. Also remember that some of the people who tell you that writing a letter is playing by their rules are the same people who a few years ago said they wanted to write one as well.
They still have not written letter. Are they scared... or confused? Who knows. I was once scared and confused. However in a personal decision I put on my big boy pants, wrote a letter and now I am completely free of them without harrassment.