Depression Support Group
Depression is a real and debilitating condition that is often misunderstood by family and friends. Its meaning can range from a prolonged period of sadness to an actual mental illness with specific symptoms. Find and share experiences with others who are going through the same struggles.
You are in an 'all or nothing' situation. In the US, you are a 'legal adult' and (given you can support and take care of yourself), you can LEAVE.
I think your situation is the same .. whether you are in US or elsewhere. I don't think you can fix this. You need to get away from it.
As for killing yourself .. or otherwise harming yourself (or anyone else), that would be VERY foolish. Much better to leave.