You make long term goals and start preparing for them. Get good grades, volunteer, get a job. Anything that will help you get into a four year college, and gets you out of your home as often as possible. Surround yourself with caring, supportive people. See if someone would foot the bill for therapy.
After you have removed yourself from the home, go to therapy. Get self help books at the library. Learn from their mistakes and vow to not repeat them. Work on your self esteem, find and know your worth. You will heal. With determination, education, support and time, you will get through this.