I know I'll have to use the females', there's no way around that fact, I'm not going to subject the two I'm sharing a tent with to the stench of my sweat, and I'm not coming out and using the guy's all by next weekend.
I suppose I was asking more of how to deal with being stared at and possibly confronted about being in there. I'm not the best at dealing with social situations anyway, and my usual tactic is just to put my head down and ignore it. I was reminded by a cleaner at work a couple of months ago that I was going into the female toilets, and I just ignored her and then hid in there until I guessed that she would have started cleaning the floor further down the corridor.
Even if I do tell them that I should be there it doesn't always go so smoothly for me, I can think of several occasions where I've had people refuse to believe that I am my birth name, at libraries, banks, garages, hotels... Not just a "no, really?" but full on arguing, one man even argued with my mother over it. I'm incredibly fortune for it in the most part, but not so when I have to do things like this.
As for the showering, I'll just have to grit my teeth and get on with it like I always have to, and hope it doesn't dump me on the floor thinking black thoughts again. I'll ask a friend to call me if she notices I've been in there too long.