Hello everyone, My name is ×××. I am 13 years old this year, the sixth grade, I immediately have to face the beginning of a small rise. I am a lovely girl, have big eyes, small nose and rosy lips. I study in the first primary school, I like English, but I also like reading, swimming, singing and skating. That is why I am.

大家好，我叫×××。我今年十三岁了，我在上六年级，马上就要面临小升初了。我是一个可爱的女孩，有大眼睛，小鼻子和红润的嘴唇。我在第一小学读书，我喜欢英语，而且我还喜欢看书，游泳，唱歌和溜冰。这就是我。

hello, everyone, it's my honor to stand here introducing myself.
大家好， 很高兴有机会在这里介绍我自己。
My name is xxx, from Class 2, Grade six,xxxx Primary School.
我是xxx，xx小学六年级2班的学生。
I'm doing well in my study, besides I'm the monitor of my class and I get on well with my classmates.
我学习成绩优秀，是班上的班长并且我和同学们相处很融洽。
I'm a happy and talented girl. I'm good at drawing and many of my drawings have won prizes. At the same time, I like telling stories.
我是一个开朗又多才多艺的女孩，画画是我最擅长的，曾多次或奖。同时我还很会讲故事。
I'm interested in learning English very much, and I believe that I will do well in future. I won't let you down!
我很喜欢学习英语，我相信我会表现的出色，我不会让大家失望的。
Thanks for your listening.
谢谢你们的聆听。

楼主自己适当改一下吧！

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　　Hello,my name is xxx. I am a girl.I am twelve years old. I study at xxx Primary shcool.I sdtuy in class seven grade six. I like growing fiowers and reading books.i am a sunny girl.this is me.Do you like me ?

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　　hello everyone,its my honor to stand here to introduce myself ! i am a student study in jiangying high school and i am active and optimistic boy .i am enjoy play basketball with friends after class because it make me feel relax . i also interested in reading it can enlight my spirits.