I can personally relate. It was my first attempt at a relationship. It was only a few months ago.
I remember being in his bathroom in the morning getting ready, and he comes up behind me and puts his arms around me..
I felt really happy..
until i looked in the mirror. I think my heart skipped a few beats, and every good feeling in my body completely disappeared.
MRH i think that it will come natural to you. I know the image really impacts our feelings, but try and focus on the feelings this supposed guy will have for you and you have for him. At least allow the sex, which definitely clouds a lot of other senses while it strengthens the ones that matter, to not be impacted by this.
And I assume you post this because you want to have sex eventually, I personally see myself as an asexual. When guys open a door for me, that's like my darn sex. But I would have sex to reciprocate feelings. Try and see it more in that way if you transition, it's not about how we look, it's how we feel! hahaha.. but it must be difficult to feel much if you are 100% turned off. Some times things are just how they are, maybe when you are having sex your woman can emerge. Maybe not physically but sprititually if that helps!