Everyone makes mistakes, everyone judge everyone for that, as a "wild teen" I made a lot but I learned from them.
My biggest one was believing that everyone was nice and lovely with me for no reason and I still do that but not with everybody, I don't regret it but there was a time when almost everyone turned their back at me and it feel even worst because I though I heard my mother saying "I told you".
Another one was believing I was right and believing I was the couch and not the player when I got played twice, I was a annoying at y high school years and when puberty hit me and everyone was noticing me I started "playing around" and thinking that everything I said had to get done or was the truth. BIG MISTAKE, I learned the bad way with a guy that tough me what not to do with his actions.
Finally and the one I think is the common one, I stopped doing things and following my dreams, I stopped dreaming, I became cold and unhappy, I made mistakes but I learned from them, to this day I still am and I think that's better to being perfect and going through your teens and early 20's without mistakes. It's okay to fall, what's not okay is to stay there for too long!