It's an easier task to imagine someone's interior world when you feel quite distanced from them. In the same way that I find writing about Australia easier than writing about the UK because I don't have the reality of it in front of me to get me bogged down in trying to be exact.
You'd think after thousands of years on this planet the human race would have released some kind of handbook for teenagers, telling them how to get through teenagehood and get help for their issues. Yet here we are, struggling through it in our own ways.