Here you are on yet another thread, and nothing is changing? Or, you're slipping back?
How do you know you're not wanted? You are sounding like a sponge, soaking up the feelings of those around you. You could be a very sensitive person who is picking up on the feelings of others. Perhaps you think their feelings are about you, but you could be allowing people to project their feelings on you.
Naturally, you feel great when surrounded by your lovely family. And, naturally, you will feel depressed around your moody boss. You are picking up on everybody's feelings.
Generally speaking, it helps just to know what is happening, then you could try to understand and develop your sensitivity as the strength it is. Smile, be happy when around this moody boss. It's his bad mood, not yours.