Stay away from the drugs. And the redhead. Trust me.

 Stay away from the redhead. If you can't stay away, tread carefully. And when he hurts you, retain your dignity. Everything will be okay. There's someone very special waiting in line for you who will make you happier than he ever could. Trust me.

 Stop thinking so critically. Stop judging before you know. Stop making choices that you know will hurt you eventually. You've broken hearts, in trying to make them whole. It's all fine. Just live your life for yourself, and let your light catch on other people; don't make it smother them.

 Wear your retainer.

 Save as much money as you can NOW! The rent for this apartment sucks.

 Don't lie. Don't cut yourself. Don't smoke. Leave him, he's abusive. STUDY. Talk to that old best friend instead. You're finally happy and you'll marry him. Things aren't as bad as you think. It could always get worse.

 If it seems like he might be cheating, he probably is; save yourself the heartbreak and end it before you give him something you can't take back.

 When your middle school teachers tell you that they can't let you in the math league because you're too shy and the boys would do better, know that someday you will be a mathematician who gets to travel the world doing what you love. You will prove them all wrong, keep on chugging.