For some context; My dead name is Midori. I came out as Non-Binary in 9th grade and later realized I was gender-fluid a couple of months or so later. I now go by Auogx (aug). These are things I wish I could go back to tell myself so I wouldn't be the depressed, traumatized, introverted, and masked person I am today. If I had known these things before, I would still be the happy little girl who loved talking to people and being friends with everyone I met. Since I can't do that now, I'll write about it.

Midori, I know you're alone at home most of the time when Mama works, but instead of eating raw potatoes and top ramen, try asking Ma to make something with you beforehand that you can eat while she's gone.
Midori, I know that your motto is "I can't tell when people are bullying me because I just ignore their behaviour," but you didn't know that thinking like this caused you to ignore your "friends" behaviours as well.
Midori, don't just follow your friend's orders blindly, take first into consideration if it feels right with you to do. You don't have to do what they ask because they're your friends, you will later learn that you won't be friends with them forever.
Midori, remember that just because they're your friends doesn't mean they have your needs in mind.
Midori, just because you call them your friends doesn't mean that they are good friends, I understand you think "They're my friends, they'll do what's right for friends to do, my friends are the best." Because that's a lie forced into you by them.
Midori, please, I'm begging you, learn how to voice your need, whatever is bothering you, and please make boundaries. This is a problem that you won't learn how to do even now, as I try to warn you, I don't know how to do any of this yet.
Midori, your characters will be how you express yourself in the best way possible. From your gender dysmorphia, trying to learn your sexuality, and trying to be your best self.
Midori, try not to worry about annoying your friends, it worries them that you stop talking randomly and get quiet out of nowhere. They aren't them, they don't get pissed and retaliate because you were doing something "wrong."
Midori, you don't like him, and you need to stop trying to adjust your feelings to match others because you don't want to hurt them, realize that you can feel how you need to feel.
Midori, just because they start to let you do things with them, doesn't always mean they enjoy being with you. I know how badly you want a good and happy friendship, but sometimes they're just using you.
Midori, even though you had to raise yourself and grow up so fast, you're still a kid, your responsibilities should not match with your parent's responsibilities.