Hiya.
My gf got stuck in your position at the start of last year when I dropped the bomb on her.
I tried everything to break up with her but she wouldn't, I love her and she loves me, doing that was horrible, but I did not want her to go through this. She never left and never gave up on me and eventually I did tell her, she was as you wher totally supportive, she has never changed, from day one she has always been by my side, and is a total rock, not even I have been as supportive of myself as she was lol.
If you are like this your boyfriend/ eventual Girlfriend is very lucky.
My gf helped with make up and show me how pretty I could be, it boosted my confidence big time in the beginning. She also looked for psychologists endocrinologists, sperm bank places, GRS surgeons, this may be a little overwhelming, this happened gradually, and you will have to gauge the situation yourself.
Goodluck, hugs Rachel