I’m referring to anyone or anything that happened in the past. Not a particular person. And it doesn't have to be just high school. It can be before, and some even after. Basically I would tell myself to be more aware of things and not be so naive. I’m glad yoy feel like you don’t need to change anything. And I wouldn’t want to change the timeline of everything that happens in terms of where I go to school or where I go to work.. More like, I would take my knowledge and tell myself to avoid certain events or people that are not very good which was painfully obvious but I was too naive.