I wrote a lot as I was growing up and then when I reread my journals, I was sooo afraid someone would read them that I disposed of them.
How I regret that!
I wrote a series of letters to my adult self so I would remember what it felt like to be young. I wrote stuff like, "TRUST your daughter!!!" and such. Laughable. But I wanted to write a series of letters back to my young self and thought it would make a great little book. But I threw out all of those letters.
Maybe I can still pull a YA novel out of what I recall.
There was a really private journal that I burned. For closure. But I wish I didn't do that either.