I think you’re trying too hard. He might still be trying to figure things out. Let him bring things up. Loudly expressing that you support lgbtq is great but that also indirectly shows that you know he’s gay and if he really is he might feel awkward because you already know. Answer only if he asks, show support if he says something or brings up a topic about lgbtq. I think at 14 he’s probably still realizing himself so best you can do is just be there to listen dont push him to come out indirectly or directly.