If you could go back in time and change ONE thing that happened to you what would it be (i am aware of consequencees if time travel (going back in time) was real)). For me i'd the change the fact that I didn't go to Rehearsals in year 10 (i have no idea what that is in other eductaion systems).
I won't go back in time myself but if i somehow could give my child self this message: I wanted someone to help me. Because i wish that somebody saved me i through that a teacher was one my side. But it won't be like that. You should tread youself good. And it's important to forgive others. But... you don't have to endure what is unpleasant to you. You don't chance anything by being silent. - N. O. and: You bad grades don't equals you being a bad kid or teen!
I'm unsure if I would change anything, I'm currently happy enough at the moment even with all the previous heartache. Changing just one thing could have massive repercussion not only for you but others - aka Butterfly Effect
If I could go back in time, I would tell my younger self from when I was in high school that it is okay to be gay. Not to deny my true feelings. If I accepted myself earlier, I would have been able to come out earlier, which I think would have made things easier. Of course there could be consequences to that, and there likely would be. If I had came out earlier, perhaps I would have had a more difficult time in high school, dealing with bullying and homophobia. Although I think it would have been good for me in a way, since I've never had to deal with those experiences.
I would've let a relationship die out on its own rather than forcibly ended it, which caused greater harm to both parties.
I'd go back twelve years and keep myself from moving to this dead-end shithole town, the one with no jobs and no future.
I would have told myself to come out the closet and to spend as much time as possible with my grandmother
I would go back two years later and save myself from my 2 previous schools. I'd just pick a right one.
Don't know if the theory "2 different past and 2 different future" will happen, that's why: I would then be able to be strong enoug to not lose that person for so long.
I would go back to my homeschooled, horrifically sheltered 8th grade self and give myself a whole list of music to listen to and pop culture to familiarize myself with, so I wouldn't look so oblivious when I went to high school.