Why are people so cruel?

I used to be a person everybody respects. I do not fear anyone because I know everyone likes me and respects me until this horrible BO condition happened to me. Everything is the opposite all of a sudden. I always fear daily that people will be cruel to me because that is always what happens.
The other day I was having dinner alone at home and some of my neighbors pass by my window and they all laugh hysterically saying: "what a pity.." in very malicious tones. I think they see me inside having a meal alone because my windows are open. What is wrong with people?It's as if they get happiness and laughter out of my misery. They know the reason why I am alone and at home. Do these people have empathy? Sometimes I want to kill these people and sometimes I want to kill myself. This is a very terrible way to live.
When I was beautiful and happy and well-liked, I used to believe that people are inherently good. But at the moment, I no longer believe this. People are inherently evil and capable of cruel things. I now understand why some people don't believe in the goodness of humanity.