I am glad you were able to talk to your mom a year ago, I would maybe go back and discuss it with her. Do you know your mom's stories? What she was like when she was your age? What she remembers of growing up? I remember when my stepmother started telling me her stories and how that helped me understand a lot more about her and our relationship and life; it was comforting and filled a bit of the holes I was feeling in myself.

You will not always be a teenager. You will perhaps go to college, or go out and get a job and be on your own. At that time you will be able to help yourself by getting professional help if you want. I would make a little plan for the next 3-5 years, work hard at my school work and try to get a little money and save up some for therapy or a car or deposit on a place to live, etc. I would try to find a few other girls who were working on their futures or wanted to, maybe find a girl in one of my classes to tutor me in a subject I find difficult or start hanging out at the library with some people to do my homework, etc.

It is both normal and not normal to have extreme moods and emotions in one's teen years; yes, there are hormones doing their thing, helping us grow up. That does not make it easier! Maybe ask your mother to find you a woman doctor, someone who might check you out a bit more, talk with you a bit, maybe there are a few things that can help you not feel as extreme? Maybe you can go see a nutritionist and experiment with what you eat and how it makes you feel: http://health.kaboose.com/foods-to-eat/

If you can make a little plan for the next year or two at least, that will give you a bit of a focus and getting in the habit of bringing yourself back to your focus will be a good habit to have for your future. Maybe check out some self help books that appeal to you from the library?