My life is in shambles...what do I do to fix it?

I'm literally a hazard to myself. I'm self destructive in everything I do. I'm almost 20. I still live with my parents who hate living with me. I'm pretending like I'm in school when I dropped out and I owe money to the college. I'm a hostess at a job where my managers hate me and all I do in this dead end town is do drugs and party. I have mental health issues. I told my mom I needed help tonight and she threatened to have me institutionalized and claimed that I use people and I don't help myself...I'm really scared of what my life is becoming. What can I do to make things right? As for my parents, I could go without never talking to them again for the rest of my life.