Keep your private life private. You'll be judged on ability, merit and there'll be no problem. If you try to set yourself apart as different in any significant way from your colleagues (and I'm not just talking sexuality here), then there will be friction. The RAF aircrew community is a very cohesive, loyal, family. Become part of it - do not fight to remain visibly different from that community.
I suspect that's not what you want to hear but I think it's pretty honest advice.