Please, whatever you do, don't send that letter. If I received that, it would reinforce to me that I was right to go. Why are you thinking about an LRT letter anyway? As Wonka says, this is about actions and not words.
I think you need to go back to the LRT sections in the books and have another look at them - back to DB 101 basics.
Hold yourself back from wanting to lay yourself and your mistakes bare and focus on actions to improve yourself.
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus