Bruce | Tony
That's a lot of guilt talking from their side probably. The ignoring you because you're young is bullshit. I remember being sixteen at Harvard and wanting to be taken seriously. Did you go to MIT really young like my Tony did? It's hard to be a genius but young at the same time.
Who is Rick? Well, in my world when we did Avengers things, he would listen to most of the team. Especially Steve, Tony, and Natasha. Now, I've got more control so he'd probably be easier to work with. I've not actually trained with a team in years though or had to fight that way so I'm not entirely sure what will happen but I don't think it'll be a problem.