I found life was much easier when I stopped worrying about whether I passed or not. I know who and what I am and have the confidence to back that up. I'm not beautiful, at least not by modern societal standards, but I'm happy. Do I get clocked? Yeah, probably, but it's been a very long time since it's happened in a way that I notice.
I now live the boringly normal life of an Aussie lesbian. Yawn. But as I read this thread, I see a recurring theme, even among those with a feminine appearance, that there is a very obvious lack of confidence with some of you - and that's what is: A) getting you clocked and B) is obvious to all who give you more than a fleeting glance.
Confidence is the keystone to passing, irrespective of looks, without confidence in who you are, there is no passing. Or you can just stop worrying about it - but that requires confidence too.