Saving a letter from an old friend doesn't exist anymore. Everything is texted or emailed.
It's much easier to write when you're sad. But you can end up isolated and depressed because you almost need to put yourself in that situation to have that angst to write from.
I lived in England to learn English. When I went to England for the first time, it was like being on the Moon. I had no friends, I couldn't speak the language. I was very isolated.

