ok, so this one could be about how a young teenager, (girl or boy) has issues with their current life.
e.g:
-they could be transgender
-they could be bullied
-they could have a relationship, and they have to deal with the struggles.
-they could be gay, or lesbian, or bisexual
-they could have abusive parents
-they could be suicidal
-they could have lost someone special in their life
and they write down their journey in a diary.
title: dear diary (or something similar)
description:(i don't have one yet, you can make this part up) inspired/credit to lildols