There’s different reasons you could be shy, but the biggest one that I’ve found to be quite true is exposure. When I was a little kid I was around people every day of my life. I grew up in a bar so I saw new people every day and I because quite the social butterfly, not to mention,I played sports in school which also helped.. But my boyfriend on the other hand, was brought up in a family that didn’t go out much unless it was to the store and he is the exact opposite. He only talks to people he knows and even then he will wait until they talk to him first.