[One possible version]
Dear Li Ping,
I’m glad that you trust me so much and tell me your true feeling, now I’ve read an article which says that it is important to be friendly to yourself first and then to others, and gives a few tips, such as forgiving yourself, realizing your virtues and not comparing with others.
As is known to all, no one is perfect，and everyone has their own strengths and weaknesses, so if you fall behind others in some aspect, it’s natural and there’s nothing so serious as for you to feel frustrated. I know you’re worried about your study because you’ve not got as good results as some of your classmates in the exams, but that’s not the most important, so long as you try your best, I’m sure you’ll make progress. Besides, You have your own virtues which some others don’t have, for example, you play basketball better than many other students in our school, and you also play the guitar well. How we envy you!
So never feel discouraged if you fall behind others in your study, and be sure you are good at many aspects.
With the best wishes!
Yours truly,
Wang Yan
略