I'm not a social or friendly person anymore ?

When I was younger I kind of was but yet had a few selected amount of friends. Now it just makes me sick when people try to start a conversation with me. Even when it comes to women they stare a lot but I would never not even bet a million dollars that they're looking because they like what they see. It seems like people are scared of me too because when I look back they turn around quick , man or woman . I kind of hate the world and see everyone as animals who just know how to communicate meaning I can care less about anyone. I will never trust another human being because jealousy envy and betrayal to some extent is embedded in our DNA.