自己写的基本符合您的要求~
Dear John:
My Chinese name is xxx.My English name is Jack.I’m fifteen years old.I live in Sanya city.Sanya city is in the south of Hainan.It is very beautiful.My favorite subject is English.We learn English every day.My teacher told us that English is very important and to learn English well is to use it.I read English every morning.I like learning English.What about you?
I hope you will write to me soon.I like making friends with you.What do you like to do?What do you like?What interesting do you have?Can you introduce yourself to me,my new friend?
Yours sincerely XXX