Dear ......,
How have you been?Please allow me to introduce myself to you.My name`s .......(你的名字)。
I am 20(根据你实际年龄而定) years of age. I come from Fujian(不是福建省可以更改) Province, China.I am an outgoing and active boy. My favorite hobbies are to play basketball and badminton.I have a happy family.There are four people in my family and they are my father,my mother,my elder sister and me. So that`s all. This is me.
Yours sincerely
.......(你的名字)