Coming out to my parents very soon... just told my brother...

I am so happy that there's at least that much understanding there. One thing I would not do in your position is change into the opposite gender so soon. I would wait until I'm in my 30s so I've experienced being that sex a little bit more, just so I can give it a chance. However, I wish you all the best on your journey and I hope you are very happy with the decision you make! Have a good one!