Hi Sarah,
What you have said is perfectly normal. What you are experiencing has everything to do with the genetics, hormones and (dare I say it) the DNA of your chromosomes. As these components change, so do various receptors in your brain change; resulting in these new perceptions of yours.
You have probably seen the typical structure of a DNA molecule. It's that twisted rope ladder type structure. As we age, our DNA structure starts to age as well. To simplify this; the ends of the DNA fibre are sealed with a protein to stop the 'ends' from 'fraying'. With age, this protein breaks down and the fibre 'ends' 'fray', altering the message this particular molecule should send to cell development. This is currently a major study point in Alzheimer's/ Dementia and a raft of other medical cases. In Alzheimer's research at the moment, they are investigating the possibility of 'grafting' 'ends' back on damaged DNA in order to establish correct function.
Also as you age, your 'E' levels will vary, which will effect brain receptors differently. Years ago I knew I looked at woman differently to men. In general, a man will look at a woman and think," I'd like to have sex with that woman". For myself, I'd look at the same woman and think, "I'd like to BE that woman". It may have been her sense of fashion, hair style, makeup or some part of her femininity that my femininity related to. In my teens/early 20's I had several submissive homosexual experiences. It was these experiences that I learnt, it was good to be able to satisfy men. Now, over the past 14 months I've been on a course of herbal phytoestrogen, and I've noticed my perception of men has changed to looking at them in the light of 'husband' material. I, too am pre-op, pre HRT, but not for long. the wheels are in motion to have all the boxes ticked ASAP.
So what you are experiencing is quite normal. The only thing left for you to do, is process your thoughts on the matter and decide what course of action, if any, you'll take. In the meantime, be safe, well and happy.
Lotsa luv
Catherine