I am honestly falling apart. I self harm and try to starve myself.

what you have on the outside is your shell. You're stuck with it and you didn't choose it, so it doesnt matter. What does matter is the thing that you did choose, whats inside. The choices you make and how you chose to live your life is all that matters. If you don't like the way you are living, you have the power to change it. you're not stuck like this. this is the part of you that you can change. all you have to do is realize that. and sometimes, the changes we make don't have to be huge. a few small changes a day can make a new person in a few months. i'm not in your situation, so i'm not exactly sure about all of the details, or if this advice will help at all, but i wanted to try. honestly, coming outright and telling a person in authority everything about your friend may not be the best thing. try making some small changes with her. again, i don't know what she does, but for the sake of argument that she smokes pot. from now on, make a comment about it, and with each time she does it, make the comment bolder and more striking. but make sure she understands that you cant live without her. maybe knowing someone loves her as much as you do will help her to get over what ever it is she does. again, i have no idea of the severity of what you're going through, but i hope this helped even a small amount! stay strong <3