Dear Haiqing,
亲爱的海青：
I am very sorry to learn that you are unhappy now. But I don' t think you should be unhappy.
我知道你现在闷闷不乐，感到很难过。但是，我并不认为你应该如此。
I know that your iamily is not rich. So your parents can' t afford to buy you something of famous brands, which makes you unhappy. But they have sent you to school so that you can receive good education and have abreght future. This is not easy for your parents. So you should think about your parents. Don't ask for something that is out of your parents' reach. Don' t be vain-glorious.
我知道你的家庭不富裕，所以你父母买不起名牌给你，这使你不高兴。但是他们送你来学校读书，使你能够接受良好的教育并有一个光明的未来，这对你的父母来说并不容易。你应当考虑一下你的父母。不要要求得到超出你父母能力范围的东西，不要爱慕虚荣。

I also thind you should put your heart into study. Read more books and then you can get a lot from reading. Without the famous brand competition you will become happy.
我也认为你应该将精力投入到学习中去。读更多的书，你能从中学到很多。没有名牌的攀比，我想你会变得快乐。
I hope I can help you out of unhappiness. Wish you happy.
希望能帮助消除不快。祝你快乐。
Yours,
你的朋友
Huang Ping
黄平