What's one thing you regret and wish you could redo?

High school is what I regret and wish I could redo. My freshmen year was my best year because I didn't give a shit and had friends. But the other years I lost a lot of friends and actually cared for my grades. I wish I would've let loose and had fun during high school. I was also shy and it stopped me from being in clubs and going to school activities likes games and parties. I think about it all time. I graduated in 2016 and I regret my high school years soooo much. 🙄🙄🙄🙄