read the following and write a letter of about 150 words in english
'you have been working to do your best to make your office function efficiently, but there have been too many obstacles against you. So you have decided to resign. Write a letter to your superior stating the reasons you wish to resign, as well as criticizing the bureaucratic inertia of the office.
"To whom may it concerned
I am so sorry that i have decided to resign
When i came to the office first time, I was full of energy and passionate to do my best to make it function efficiently. But as time has gone by, i have realized that none of my collegues wants to be as i am. They are lethargy and sluggish to do works, affecting me in bad ways. Whenever i ask them to do our best on the works, they just say "Don't be so enthusiastic on it. Though we do not get it, there are bunch of people dealing with it." I have tried to deal with the situation, but just found that there is no solution.
It was a hard decision to resign this job since the company has offered me good payment and other stuffs. But without a tonic in the field, i can not keep going here.
I am sorry again for this
Yours sincerely
Joseph Choi."
p.s. hope you can correct me in grammar and other errors

and since i am still not that familiar with dealing an official things please let me have a tip to make it (like how to start and finish the formal letter, and usual contents )
thank you for your help =)