Keeping the knowledge you gained since then, what changes would you do? Only rule is you can not change major historical events, only personal ones. For example, you can’t stop the attacks on 9/11, but if you knew someone that died that day, you can ask/tell them not to go to work that day or take that flight.    EDIT - you would continue your life from that point, high school is just the starting point.    For me, I would have taken more chances with some of the women that I