one possible version:

　　dear editor,

　　my biggest problem is that i’m too busy. when i was young, i used to have so much free time, but these days i stay in school all day. before i started high school, i used to spend a lot of time watching my favourite tv programmes, but now i have to study. i love music, and my mother used to take me to concerts. these days, i hardly ever have time for concerts. i have to go to different classes at weekends.

　　i’m very tired. i really miss the old days. i wish i wouldn’t grow up.

　　best wishes

　　rose tang