建议把难度稍微提高一下,意思相同的次可以替换,修改句子结构而不改变句意,并加一个结尾：

建议把难度稍微提高一下,意思相同的次可以替换,修改句子结构而不改变句意,并加一个结尾：
Hello,ladies and gentlemen.My name is Elijah.I am a 13-year-old gentle boy,because my classmates always say"Oh,you are really gentle."But in fact they say"Oh,I cannot bear you,you are so boring!"And I do not know why.So today I will talk about my character.
I am sweet-tempered most of the time,for example,if you lend your classmates a pen.Then he or she broke it.Maybe you will let him or her buy a new one or give you the money.But I will not do that.Usually I will forgive him or her.Although I can bear this kind of things,I never forgive someone whose broke the most important things of mine.
Sometimes I am humorous.About three mouths ago,I told my friend something crazy about Equivalent substitution “The customer is God,God is a girl,so the customer is a girl.”After I told him,he laughed all day.And by the way,my math is really nice.

大致改了下,楼主看是否合用,说实话原文还是差了一些.
Hi, ladies and gentlemen, my name is Elijah. I am a 13-year-old 'gentleman' because my classmates always regard me as "a really gentleman". However, I know what they really think is that I am boring, but I could not find out the reason. Therefore, today I am about to talk about what kind of person I am.
In my humble opinon, I am a person who have good temper most of the time. For instance, if one lends his/her friends a pen and the borrower broke it, usually the lender will ask for a new one or charge the borrower money equals to the pen's value instead. However, if it happens to me, being the lender, I will not ask for those but to forgive the borrower without charging him/her anything. Of course except for the thing one breaks is the most valuable one.
I got some sense of humor at times, I have just told one of my friends a joke three months ago and he laughed for the whole day. It was about an Equivalent substitution that “The customer is God,God is a girl,so the customer is a girl.” It is so funny, isn't it?
Last but not least, I have a special talent on mathamatics and I do good in exersices and exams, classmates are very welcomed to come to me when problems relating to math occurs.
In a word, I am a nice person and I can be interesting, why not being friend of mine?
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再问： 很好，但是可以再把数学那一段用一句话带过吗
再答： OK，那就把Last but not least那一段遇上一段合并，即去掉该段，从isn't it?后面直接接： By the way, I do quite good in math and classmates are very welcomed to come to me when problems relating to maths occur.