Did you join a Free Company? That's where you're going to get your social interaction. It's true nobody really talks in dungeons, because they're just getting through the fight, and they'll usually be from another server, and you'll never see them again.
So join a Free Company. See who's recruiting (shouting messages in towns), talk to the people recruiting, find out what they're like. And if you join an FC and it's not what you hoped for, leave and join another. Free Companies are all about trial and error. There are definitely good ones where you'll find what you're looking for.
You shouldn't really need to watch videos for any of the ARR stuff. Most of it is relatively straightforward, and most people doing them now have done them before. If you're getting kicked, you shouldn't be. Are you telling the people it's your first time in? I've found people to be very forgiving if they know you haven't done the thing before.
The main quest is LOOOOOONG. There's a lot of filler. A lot of "quests" that are effectively just cutscenes. And a lot of weird little fetch quests. But the story is good. The dungeons and trials are great.