不想当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）

不想当英语课代表的辞职信可以这样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.