Tldr Confused on what the... incentive(?) is behind talking to another person?

Hello all, got a really strange question ive been hung up on for a few weeks. I understand that approaching and starting a convo is necessary to get the ball rolling, im rather lost on the Why of it all?

Growing up ive really only spoken to others when we were in close proximity (School) or when it was goal/outcome dependant, like ordering food or asking questions to complete a task. This idea that people talk (I guess just to hear themselves talk?) is so wild to me because i dont get it? is this just further self esteem issues like my last post here?

FWIW my parents never really spoke to me growing up, moreso AT me, so that may be part of it?