Dear XXX,
Upon receipt of your letter,i noted your trouble and your present thoughts.As a friend older than you are,i think i can give you some suggestions for your future.To begin with,you should bear in mind that young people should look forward to their future life instead of thinking over their past over and over.In addtion,please focus your attention on your future major and make detailed plans for your academic development and future career.Last,cultivating more hobbies will make your life colourful.Swimming,jogging will be very good methods of diverting your bad feelings.
Hope that you will get fine.
Yours Truly,
Li Lei