*whispers* "Pssst. You have ADHD."
Also: Don't worry so much about trying to solve your friends' problems. If you can't fix things and all you can do is offer them a shoulder to cry on, then just do that, wish them the best, and go back to worrying about your own problems -- the ones you do have a bit of control over.
And speaking of friends: don't try so hard to hang onto old friends if they aren't doing you any good anymore, and don't think that you need to hang out with friends "fairly" by spending equal time with them. Just hang out with whoever makes you happy and whoever isn't seriously draining you. Better yet, you don't have to choose between struggling to hang on or losing them forever -- you can still be friends, just at a more comfortable distance. It's ok, it'll all work out.
And lastly: keep drawing. You'll get better at it. Oh, and take more art classes in high school.
^ The first three would save me from the absurd amount of stress and anxiety I went through in high school. That last one's there as a confidence-booster. I didn't draw enough in my early/mid-teen years, and I nearly gave up on drawing altogether, deluding myself into thinking I had more potential in making art in Photoshop (ohohoh, ho, hoh.......). I'm getting better now, and it's been nice to see the improvement in recent years, but I regret all the lost time.