Starting out a new thing – like trying to write in a journal that can be potentially read by anybody – is a pretty challenging thing. You get to screw up, and you don't have anybody to blame for your mistakes. The good thing about it – nobody will know about those except for you, because when you are starting out, you are really the only person who cares about the thing.
Yes, I feel like I was very stupid to have accidentally deleted an entry which I was not intending to delete. But the realization that randomly deleting a random entry in a journal was the worst thing of the day, made me understand that I indeed had a very good day.