Just hang in there. There's a lot of bad stuff coming up, and its going to be hard. You're going to hurt yourself and your life will never be the same. But once it's all over, when you can give your younger self a chance to change something, you won't.

 Stop wasting your time trying to change. You're better than what you want to be. I wish I could be what I was when I was you.

 Spend more time with mom.

 Do whatever it takes to get him to stay even if he says really hurtful things. If not he crashes 5 minutes later. You find it. He dies 1 week later.

 Let go of your Anger. Love yourself. And let others Love you too.

 Don't cheat on him with someone who doesn't even care about you. He will give you an infection and leave your ass. The boy you're with loves you more than life itself and he would literally die for you. You're so stupid for throwing that all away.. He never deserved you in the first place.