Nopony should bottle up their feelings. Sometimes, all a pony needs to do is talk with their friends. Sometimes, all a pony needs to do is pretend someone's listening. So, Diamond Tiara hides in her room, writing away her troubles with letters.
"Inspiration comes and goes; that's neither a good or bad thing. It just means that I'm going to sit here and be lazy until I don't want to be." ~Some a**hole who quotes himself.