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? 
FORGET THE PAST.
Appreciate your parents
Always keep fighting
Anything is possible
It will work out someday not today but someday :(
1. What you're thinking & feeling is unhealthy, not just a phase and seriously needs to be addressed. It's also surmountable and you have the strength to do it.
2. Talk to your friends - they care about you.
3. Even though your parents likely won't understand, they still love and care about you.
4. Give yourself a little more credit and believe it when people compliment, want to be around you, get to know you. It seems implausible now - but trust you will miss out on so many experiences if you don't take a chance.
5. Stay focused. Time marches on never-ending, and you'll be surprised by the things you can achieve if you just keep at it.
@Jadeharris hi
To be more cosiderate to others and to watch your tongue.
Not everybody is your friend and you can't be everybody's.
Not many people are going to like you, so focus on the ones that do.
stop fighting with your family, you'll never win but you'll always cry.
books and music aren't the only things that can help.
you're depressed and that's okay, you don't need a doctor to tell you what you're feeling.
Write the good things in your diary not the bad.
Enjoy your youth. Go out, make friends, fall in love. Stop worrying about the future all that matters is the present.
@Lostsoul1876
Love the way you wrote it, Im agreed all the way, my friend. I wish you all the best ahead. Make you fall in love x 
Life goes on