Okay, Kat, I'm going say the cliche. I know what you mean. But this isn't like everyone else. Let me count the ways.
1. I have a Depressive Disorder (brain chemical imbalance) so I can relate about disorders.
2. Homeschooled. I also live the life of a pariah; shut up in my room with my only friends: LEGO Bricks, Podcasts, and my dumb brother.
3. I do some theater; I know you don't. However, in theater, directors play lots of favorites. I have never been lucky enough to be one of these. So I sometimes crave attention, wonder if trying out for a play is futile, and feel bitterly towards the other kids.
So in my opinion, the solution is not to spill your whole opinion on the public. Instead, when you feel like this, confide in your friend. In that moment of anger, PM Orb. You guys seem to be best buds, and I bet you two could really talk it out well.
Anyway, that's my two pence.