I can’t make a diagnosis on the basis of a short letter, of course. But if you were seeing me, I would want to know more about the environment you have been living in. It’s possible that the drinking and violence have had a greater effect on you than you realize. It makes sense to me that you distance yourself from a situation and people you find so distressing. That doesn’t mean that it is the healthiest approach to your situation; just that it’s an understandable reaction.
I hope you will consider talking to the guidance counselor at school if you have one. If the school doesn’t have someone on staff who talks to kids about their problems (instead of just about scheduling and homework issues), ask for names of therapists in your town who specialize in working with teens. Often there are free programs for adolescents. A therapist will help you get to the root of your distress and will give you encouragement and support along the way.
In the meantime, if you need to talk to someone about your problems — at any time — you can call the Boys Town Hotline. Don’t be put off by the name. Counselors there talk to girls, too. They are available 24/7 for kids like you. You can also chat online. It’s all free and confidential. Here’s the website: Boystown.org. The phone number is 1-800-449-3000.
I wish you well.