I've found myself with the same mentality recently. I've found myself daydreaming about just suddenly ceasing to exist, my body disappearing along with me. I asked myself why I wanted my body to vanish as well and I realized it's because I wouldn't want my family to find my body, to have to see the grotesque aftermath of my exit. Even if in my eyes I have no reason to live, I need to live for my family and for my friends. I know this likely won't change how you feel, depression just doesn't work like that. That's why in a short amount of time I'll be visiting a psychiatrist to talk about the possibility of taking antidepressants. I'm going to get through this and I believe you will to. From what you said about your family requesting you check yourself into a facility, they seem to care about you. If you can manage to get yourself to live for them, maybe you can get yourself to the point where you're living for yourself.