Составьте пересказ по английскому

I just got your letter and i of course i would happy to help you.
A lot of teenagers feel the same way as you and there is nothing.First of all,you shouldnt worry too much about your weight.It will change,because are will grow.It might a good idea for you to start do some exercises and follow healthy diet,be sure you will lose your weight.
I hope my advices will help.
Let me know,how it goes