If you could write a note to your younger self, what would you say in only three words?
I had two thoughts. 1) Words can hurt. 2) Try your best.
What would your note say? 
I would tell myself to have fun and relax! Enjoy having freedom and youth of course. Travel see the world explore don't worry about settling down and having children the fear of lonliness will follow you even after marriage it's not a fix so don't chase that thinking its a cure. Search the world to find the answers you seek and most of all as cliche as it is find yourself!
(its to late now but...) Dont
let your past ruin your future and your relationships with people close to u.....
Find the truth
Things don't always turn out be like you think they will
Always treasure your loved ones because when you least expect it they will be gone.
Take a deep breath, kid. Always bring your headphones with you, no matter where you are. It'll help. I know how scared you are about where you're going, and I know how much it's going to hurt. I'm still recovering from what it did to us, but trust me - it's worth it. I promise it's worth it, and I have no doubts about that, because I'm writing this to you right now, which means I'm still alive. You're still alive. You make it through this. You know you can do this, because you already have. Deep breaths. You're gonna be okay.
It'll be alright.
It's not you
Wait,watch,listen
it's your life and only you make choices