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? 
Shoot beyond necessity.
I've lived my life doing just what is necessary and now that I'm a functioning member of society, that doesn't quite work anymore. I've managed to dig myself into this hole. Anybody think they could help? Don't quite know where to start.
I would tell myself not to be in a hurry to grow up
Whatever color or race you are you should know your individuality is beautiful
Bullying happens to many kids and bullies only do bad things to make themselves feel superior and they too were probably abused
Depression is a real actual disease and many have it or have had it so you are not alone
Don't live an unexamined life.
You are only a kid. It is their problem, not yours.
Be brave, kind and funny.
3 words aren't enough... I would say "I'm so proud of myself for being the better person and walking away from a toxic situation".
Don't do this...you are better than you think
You are worthy. It would've been really helpful
Never compromise
Don't give up.