The movie is pg-13, I think it has a yellow cover, and it was probably released in the early 2000s. All I remember is the opening (or close to opening scene) where a teenage boy gets up on stage at some type of talent show, and purposefully slices his hand open. I also have a vague memory about a group of kids talking in a bathroom. I don’t know much else because my friend’s mom turned it off, thinking we were too young to watch it.
I’ve been trying to find out what movie this is for years now so if you have any ideas PLEASE let me know!