英语课代表的辞职信

Dear teacher:
I'm sorry to tell you that I must give up this job.I hadn't done this job very well.I feel so sorry about this.
Teacher,I beg your pardon,but I have no choice.I feel tired and I think there must be someone who will do this job much more better than I do.
I love this job but I don't think I meet with this job.Job is a good job,but I'm not a responsible representative.
Though I don't want to continue this job,I won't give up english.I'll try my best to study ehglish.If one day,teacher think I still have the ability to be your representative,I would be glad and thankful . And if at that time ,I would be cheerful to be your representative again.
Thank you for your comprehend
your student:~~~~~~~~
time：
（现场发挥，如有语法错误，请原谅）