You haven't posted much total information so my responses will be all over the board. I assume you have had some voice training for singing but I don't know if you have your speaking voice worked out yet. If not you should work on that because sometimes people have the range to work across several octaves and retain the ability to sing in both the female and male range.
You also didn't indicate if you are considering voice surgery. I am still in the healing stage and not a singer yet, but if singing after surgery is important, you need to understand exactly what your current voice is and what the surgical results will be. I am surprised that my old voice was unusable for singing but the new voice while still range limited has far more range than the old one.
I spent a couple of months mapping out my old voice and learning about it before deciding I couldn't feminize it. With what I knew, my only option was surgery. You need to map your voice out and decide if you are happy with it or what treatment you desire.