I do this all the time too, and one day I decided just to look it up and we what it’s called. Rumination. Honestly for me, just reading about it, finding out that it’s super common, and giving it a name helped. When I find myself thinking about embarrassing things I did years ago or replaying things I just think “oh I’m ruminating again” and it usually goes away for a while.

https://www.mind-diagnostics.org/blog/repetitive-thoughts-and-behaviors/what-is-rumination