Passing is important to me, for the simple reason that I find life tough enough without dealing with stares and comments behind my back. I don't have the confidence or self esteem of some of you, and incidents that someone else might be able to deal with and brush off would leave me shaken for weeks. It's one of the reasons I have a bit of an issue with the seemingly cure all solution of more confidence; I can't just decide to 'own it'. Some days I feel good, others I want to stay in and see no one. I met a non passing trans woman once who lives in a less accepting town than I do; she was minding her own business, not rising to taunts, and she had all of the teeth kicked out of her head.
Thankfully I get by ok, but I put work into it, I've spent a lot of time on my voice and I learn as much as I can, whenever I can. Just because I don't want to/don't have the strength to live my life as visibly trans IT doesn't mean there's anything wrong with me or that I need to change my thinking. I know me better than anyone so I'll do what I need to to be happy.
With changing rooms in gyms, for me they are off limits until after surgery. That's just my personal view on it, I feel like I'd be crossing a line going into an environment like that with a penis. I don't think any amount of confidence or 'feminine energy' is going to make the situation better when a woman sees male genitalia whilst she's getting changed.