The bathroom with the shower in my house is covered with mirrors. Like, the mirror wraps around the entire bathroom, and it's one of those waist up mirrors. :/ So no matter what I try to do, I always wind up seeing my boobs and it's really depressing and triggering for me. Generally I'll take a really hot shower for a long enough period of time so the bathroom fogs up more then the little air vents can let out, or I'll wrap myself in a towel before I get out of the shower and bolt out of the bathroom into my mirror-free bedroom before the fog can clear up.
I'm trying not to dissociate anymore because I've gotten so used to dissociating that it's affected everything. Like, nothing seems real to me anymore, and it's scary. So I'm trying to stay as "real" as possible. >.<
My dysphoria is generally at its worst at the end of the day when I get undressed and ready to take a shower, actually. It's just so depressing when I take off my binder and my boobs fall out. And as I've said, it does not help that the genius who built my house put friggin mirrors all over the bathroom. I've taught myself not to look down at my body when I shower because it's really triggering and I'm trying to kick my SI addiction. =_=; My days seem to run in a cycle. Like, at the beginning of the day I'm not that dysphoric since I get dressed in my guy clothes and my binder. Then it slowly goes downhill from there as I go throughout my day since right now I'm living as a female and nearly uses female pronouns on me, and it doesn't help that in Spanish class, I am forced to use female pronouns to address myself since no one knows I'm really a guy. :/ And I'd get points off if I use the "wrong" gender pronoun thingie. ;_; And points off means lower grade and ahh. I can't afford to get a low grade.
As for how I cope with my general dysphoria, it depends. In the past, and sometimes in the present, I'll use extremely destructive coping methods. Remember that SI addiction I mentioned? That's one of the bad ways I'll cope with it. x_x; Though recently I've gone on to drawing my dysphoria, which is much more productive and healthier than SI is. Or if I'm not feeling productive, I'll play the sims and live out my fantasy life as the guy I am.
But yeah, you definitely aren't alone with the whole mirror thing!

And sorry this turned out to be a mini-essay of sorts.