Oh dear!
When I was reading your, I kept thinking; "I hope she posted her birthdata. I'll need to look at the 6th and 12th houses". As I got to the end of your post, I saw your chart. Jessica, that's some tough energy to handle.
In my experience in natal astrology, which I have to tell you is only like one year, I found that 6th house placements are generally related to burdens and depression. The 12th house is about escapism, self-undoing and hence; drug and/or alcohol abuse.
You have a very difficult opposition between two stelliums, one in each of those two houses. Aspcets between planets usually mean that these planets excite and energize one another. Your stelliums are stimulating each other in a very stressful way.
Of course the nodal axis in Pisces/Virgo is not exactly help here.
Now, don't let that scare you. The first step towards solving a problem is finding out what it is. Obviously, a considerable portion of your problems comes from the energies of your natal chart. But natal charts are just a snap-shot of potential energies, i.e. it's not your fate, you have free will.
What you are going through at the moment is just the negative side of your natal placement. Believe it or not, these very same placements have a wonderful bright side.
First of all, I personally prefer natal charts with stressful aspects. I have found that people with more stressful aspects have potential to work hard to actualize their dreams as opposed to smooth-aspected chart natals who seem to think they can ahve it easy. I realize that this is a generalization, but it applied to many cases that I studied. What I'm getting at here is that you are a person with great potential to be a self-actualized person.
Second, the 6th house placements give you potential to be a hard-worker, a quality that is highly appreciated. Although your 12th house placements could get you to fall for sob stories, once you figure out that it's fine to pick those whom you want to serve/help, things will be fine. You must resist the tendency to want to save everyone without thinking rationally.
Also, whatever you do, please do not believe that you are a victim. If you do, then this is the 12th house stellium playing tricks on you. I realize, from your story, that you have had it harder than most teenagers. In fact, I'm sure I don't even know the half of it, I realize that this is only the tip of the ice-burg. However, you have a choice in this life. Some choices are harder than the others, but that doesn't give us the right to declare ourselves victims to choose the easier way out (alcohol in your case).
The 12th house placement makes you sensetive. That could be either good or bad. It won't be bad if your do not allow yourself to be too sensitive. Also, I cannot help but believe that you must have a wonderful spiritual heart inside of you. Resorting to spirituality can help you, and you can use it to help others because you have the ability to be a spiritual leader. I'm not encouraging you to start your own cult here. It's just that you can achieve the alternative consiousness that you seek through alcohol without alcohol, but with your heart.
You have the Sun in Taurus. Identify with its energy and use it to get a practical approach in life. I think you are already starting since you are worrying about graduating when you still have the problems that you have. Worry doesn't do work though, you do. If there's something that you want, work to get it. Don't listen to the 12th house placements that'll keep you dreaming without working, listen to them when they give you dreams to work on.
Well, I'm almost done here, but there's a lot more in your chart that needs exploring. I bet you'll get good advice from the many gifted members of this forum. So, I'll give them room and wrap this up. But before I go, I'd like to say one last thing. With that Cancer/Capricorn ASC/DSC, you'll feel responsible for the world. You'll want to make things better for everyone. Jessica, you are not and you can't. You are only responsible for yourself and your actions. And you can only make some things better, not all of them. Help yourself first, then help others. An empty bottle cannot fill any glasses. In fact, you shouldn't fill any more glasses, if you know what I mean. Listen, if you feel that you have a serious alcohol problem, you need to join a support group or see a professional about it.
OK. Now I'm done. Good luck. Hope I've been helpful.
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Good question!
If you pour cold water into your carburator and the car stalls, the car is operating as it was intended to operate.