Alice,
there is no need to feel uncomfortable here. Everyone has had their own problems and doubts and you aren't the minority.
The term transgender envelops a whole realm of preferences when it comes to if people want to transition and if so how far to go. I can't speak much about the hormones as I am an F to M, but leaving your penis intact is your decision. Nerves are difficult to work with and expect them to function as they did before surgery. Children have a better chance of regaining feeling after damage or surgery to nerves than adults, but they can't have transgender surgeries anyway.
I don't have any erotic feeling in my penis, but I knew that going into the phalloplasty. It was more important to me to have a penis than to have normal feeling. That doesn't make one of us right and the other wrong, its merely a difference in priorities. There are undoubtedly people who would accept you as a woman even though you still have a penis.
As for vasectomies, If done right, most men who have had them function just fine. Realize that there is a small percentage whose vasectomies reverse themselves. You would still have testes though, so you would also have testosterone. I'm not sure what the results of having both male and female hormones in the system would be long term. Everyone's body naturally make both hormones, its just that cis men have far more testosterone and cis women have more female hormones.
An endocrinologist would be able to give you a much better idea of the long term effects.
sam1234
