我需要帮助，英文好的帮我下，please help me !!!

Dear Mr.XXX,

With sentiments of profound regret I am writing this letter of self-criticism to you.

I now really realize that I was entirely wrong in the absence of trainning without permission for some times. And my dismiss of the team has placed me in depression. I beg your pardon on my misbehaviour and that you mete out an opportunity for me to recover myself.

I sincerely hope that I could return to the swimming team, and promise to avoid any repetition of such things in the future.
Please accept my sincere apology and petition with gratutude.

XXX

(提醒：后悔的事不能再做了。这样的信只会帮你一次的。)

你写出来我们可以帮你翻译，叫我们帮你写不太好吧！！！！

oh my god