You had just killed the group of bullies (3 girls, 2 guys) who gave you trauma and scars. Suddenly a man appeared

???: "Come with me. There is no time to explain."

Before you can react he grabs you by the wrist and pulls you into a time portal. You can see different moments in the history and the future too.

???: "Close your eyes."

you do so.

???: "I am going to send you back a week from today. Dont kill them. Dont stand up to them... suck it up for now.. otherwise, a major event cant happen, causing the end of this world."

you can only nod. You return back in time. You are in the bathroom crying. You look around and hear the bullies enter. This day was the first time you stood up to them. They all see you.