I Am Fascinated By Human Behavior

Has anyone else noticed people are generally less social than they used to be? It seems like a lot of people are not interested in having friends and don't want to be bothered with other people. I've tried to be social with some people and it's like they don't trust you or think you're trying to take advantage of them or something. I know at least part of it is people are busy and don't have time to have a ton of friends. Plus people are very selfish.