中文道歉信的格式是什么？

Dear mum,
I'm very sorry that i burst out my anger. I shouldn't argue with you and hurt you with those mean words.
I know the reasons why mum stop me from joining the dance competition. I knew it very well and yet because of my selfishness, i hurted your heart with some mean words. I felt very bad about it. I'm so sorry mum. I din't concern bout how you feel that time.
I'm very grateful that mum take good care of me all this while.I never hear you whine about it eventhough you feel exhausted. I feel very thankful for the warmth and love u give to me with wholeheartedly.
Mum, I hope that mum can understand how much I love to dance.At the same time, I wish mum can forget all the unhappy past. Dance is now part of my life. I don't wish give up on it because of others people's fault which is none of my business. I hope mum can feel my sincerity in apologize and support me in what i love,which is dancing.
Mum, I know u love me and so d