I used to daydream about what I would do if I woke up in my 17 year old body as a high school senior, complete with all the knowledge I had gained since. What w

I used to daydream about what I would do if I woke up in my 17 year old body as a high school senior, complete with all the knowledge I had gained since. What would I do differently if I knew then what I know now? Getting married and having a kid killed it, though. Doing things from scratch would at a minimum mean having a different kid with the same wife, so now when I fantasize about this all I think about is what I would lose.