Hola Testigay,
Of course she is disappointed. It now has become clear you do not wish to walk the same way as she has done for some time and probably will do for some time in the future. Did you also tell her of your sexual orientation? If yes, that sense of disappointment may have also arisen from another perspective. Why not talk to her about it?
By what you have related to us, it seems she is treating you well. The least you can do is return her that courtesy. She has had to put up with many of you inconveniences when you were growing up. I'm sure you will be able to find ways to express your love for her.
Cheers
Borgia