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? 
God first
STAY IN SCHOOL
I Would Simply Say To Myself " Leave Your Family " & I Would Go Seek For Help
There's nothing wrong with you if somebody don't care about you . It's not PERSONAL ,love .
Avoid the uncle, (that's for the 8 year old)
whatever weight, you're fine (the 16 year old)
Keep the internship. I was awarded an animation internship at Disney. I had no family support, and no money or way to travel. Instead of figuring out a way or asking others for help, I turned down the internship. I feel that was one of the biggest mistakes I made. I made it out of fear and loneliness. It still bothers me from time to time. I know I can't change the past, but I do know my life would have taken a vastly different career path if I had gone to Florida.
4 phrases came to mind....
You will understand
Stop making excuses.
Visit your Grandad.
Embrace it all.
It's okay to be weak some time. You don't need to weight the whole world on your shoulders.
Be happy. Find a way to make yourself happy.
And I love you very much although it might not so obvious some times.
Keep staying strong.
It gets better