Not just mistakes, but putting up with the types of stuff I did in HS simply because. The moment I realized how independent I could be and didn't have to rely on people was when I started enjoying HS. So many people just get stuck in their "cliques" and can't even determine what to have for lunch without consulting 8 diff people. Now, I could actually do all this stuff on my own, not care about what my friends were doing, approach everything so much more wiser/maturely, and have much better routines.
Then again, there were many things where even if I could do it over again while using future knowledge, I still probably would hate having to do. Too many tedious things in HS and timewasters. 4 years of having to learn/memorize Shakespeare plays, learning about what to do if you want to solve for X if you know A,B,C,E, and you have to take into account a random triangle shaped item in the middle of it all that you have to subtract out of this equation lol.


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