I used to have saving turned on for my MSN Messenger chats back around 2001-2004. I didn't lose them. 10-15 years later or so I had a look through them and the cringe was so powerful that I deleted them all anyway.
This was very unexpected to me because in my mind the changes only happened as I became a young adult. The evidence of these decades of logs shows the change continued to happen as an adult.
The cringe is rough but at some point the cringe becomes so bad it loops back around to me just feeling nostalgic and grateful that there's proof I was able to do things, create, be silly, whatever without worrying about appearances so much.
Also, I figure if I ever become a megalomaniac then old youtube videos of my teenage self doing parkour should go pretty far in humbling me (although, honestly, I think 13 year old me was way cooler than I am now, so I guess it could backfire).