What made people so antisocial?

I met a girl at a coffee shop and I asked her out on a date a few weeks ago. She was getting a drink and I got her number, I stayed because I had stuff to do. While I was working a lot of people came up to me like a bunch of cavemen after I made a fire asking me how I got the girls number, what made me have the guts to approach her, how they can do the same and how to be more social.

what made people this way? I often talk to people everywhere I go but apparently no one does that.