Imaginary conversations that go on inside your head don't get picked up by people in vicinity you know, real sounds of words being spoken have to come out of your mouth to garner attention.
Obviously you get overlooked a lot and this will continue to happen until you don't make an effort!
5. You have no clue how networking works!
Hey, the whole point of meeting people in public is to build good network. That is going to help you climb the ladder up to your desired level of social standing.
So start talking to people. As you know, the world works through contacts these days and you have few to none!