Answer:
I would tell my past self to quit worrying about the little things, the things that don't matter. I would tell myself to enjoy the time I have in middle school, to be stress-free, not care what people think, because as you get older, these things tend to pop up. If I had this advice, I wouldn't have wasted a lot of my middle school time worrying about my looks, hanging out with the wrong crowd, and, instead, I would've enjoyed the time hanging out with my friends, and being happy, and stress-free. Eventually, things start to get complicated as we enter high school.
Explanation:
I hope this helps :)