Dear Lily,
I am writing to give a suggestion.I heard that you want to give up your study and do business.I don't think it is a good idea.Nowerdays, the world is changeable and complicted.What the world need is capable people,especially the competition is very fierous.Besides,you are still 14 years old.At this time,what you need to do is to finish your compulsory education.So please take my suggestion in to consideration.I hope you can think about yourfuture seriously and then make a right decision.
Yours,
Tom 你可以适当的修改下