(okay, I'll say firstly that this midday I'll leave to holiday for 3 weeks, so I cannot answer your replies in that time)
I understand she wishes it to 'pass by' eventually, my parents probably would too, but as you're dealing with this for quite a long time I REALLY hope she'll eventually accept you as who you truly are, and see that transitioning isn't an 'option' but a necessity! And she sees you are truly male, not a 'girl wanting to be a guy' or something like that, but just as much as a true guy as a cisguy.
I probably cannot read how it went, as I'll be away already, but I'll keep my fingers crossed for you. It's good not to have too high hopes though, as then you could get another enormous blow like before. Ms. De Johnge has more experience with transpeople, right? As she's part of the VUMC gender team and all. So I guess she should understand your situation (I really hope so at least!)
And otherwise, can't you just say you want to 'try' it out for a while at least, and then get them to continue calling you Bryan (or Kent. I like Kent better too, so I hope you can get that name

though Bryan is a nice name as well). After I 'accidentally' *coughcough* turned into a guy in LARP, people jokingly started to address me as a guy OOC as well, and then I told them that they should call me Erik and not my birthname if they want to do that, at first they joked about it, but now it's my 'nickname', and lots of people call me that all of the time, lol!

I understand that made you feel uncomfortable, yeah. Often when someone cries I just don't know what to do, I want to do something to make them happy again, but often I can't... and they just need some peace and time to cry out.
Well, you sure haven't committed a crime. You just want to be who you are, that's all. I totally understand your feelings though, I'd probably feel about the same :/ I just hope that in time they'll understand, and will accept you as the guy that you are!