Dear Mr./Mrs./Miss ____,
Thank you for leting me work in your company. I have learned a lot during this short period. However, I am overwhelmed with the demand of my job and long hours required of me. It puts a great deal of stress on my family. I am afraid I can not handle all these at once. I'd better find another job that I will feel more comfortable with. This letter is to serve as my 2 weeks notice of quitting.
I will miss you and the co-workers who have given me tremendous help.I wish I can find someway to balance between my work and private life.
Thank you again for giving this opportunity. I truly appreciate it.
Sincerely yours,
xxx