
I don’t have these legitimate concerns, and I STILL keep stuff like that as thoughts in my head. The only reason I’d journal my thoughts is if I eventually wanted someone to read them.
I keep my journaling for things I actually do in real life that I want to keep track of.
What is the purpose for writing it down? When you know that answer, then you look for the safest way to accomplish that purpose, which probably isn’t a diary.
There are commercial ones — but they sell to businesses, not individuals. And whether they’re trustworthy is open to discussion.