Hi Cheer,
I'm sorry to hear you are going through all this stuff in your life. I'm concerned that you are drinking and feeling like you can't stop. Are their any support groups such as Ala-teen or Ala-non in your area? If so, please give them a call. You might also find help at your county mental health clinic ( you can google mental health in your county), and at planned parenthood, where you can receive medical care at little or no cost. I encourage you to take care of yourself and try not to get caught up in the foolishness between your parents.
No matter what others say...
You are a valuable person. Don't give up - get help!