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? 
Don't be afraid.
Keep on moving.
Focus on yourself.
Focus on school.
No relationships now.
Don't be sad.
It'll be okay.
I had a lot and just wrote them down as they came to mind.
1) Don't let criticism stay in your mind. 2) Don't change because someone tells you to even if you love them 3) explore and experiment don't let being the good girl hold you back from life. 3) Stay true to yourseld. 4) No matter what anyone says you are not a fuckup You are a caring wonderful person. 5) Don't let relationships make you cynical. You deserve love.
You deserved better.
I Would tell myself not to sweat the small stuff.
Believe in yourself.
be kinder to yourself, you're doing the best you can
past, future: PRESENT
Hate is jealousy
The world is a strange, confusing place and the people more so - but have faith in yourself and know that so long as you don't give up and believe that anything is possible, life has a way of working itself out more often than not. Life is short and chaotic so enjoy what you have while you have it and let tomorrow bring whatever it has to because that's another day.
Don't worry about the future and don't be stuck by the past. Enjoy the present!