Sorry to hear that you're having such a hard time. I lived with people who were extremely "sorted", when my depression was at its worst and I was unable to function, our differences, and the resulting arguments, amplified my negative feelings. It's really important to not blame yourself though; it's a series of issues and circumstances which have led to it, and there's always a way out.

Do you work, or attend college or any other kind of group outside of where you live?
Do you feel like the main person in your group fully understood or listened when you explained to them how you feel?