Hi so I'm a trans guy and frankly, knowing that you are acknowledging some possibly internalized transphobia is a big step in the right direction for the subject. It's very easy to see trans guys differently than cis guys because of how trans people in general are portrayed in the media and growing up in a blatantly transphobic society doesn't help either. However, it's obvious that you want to consciously battle this way of thinking. While it is impossible to choose who you are attracted to and in what way you are attracted to them, there are many internal and external factors that go into it. This is also why first impressions are always such a big deal. Everything about a person from the way they look down to the way they walk can affect the way you feel about them. The nature vs nurture argument is important to note here. In reality, nature and nurture both affect the way we perceive the world and I would say that they way you perceive trans guys is from the nurture side of things and growing up in such a transphobic society. Things that are learned can be unlearned so, maybe in the future, as you hopefully move towards unlearning the perceptions you have of trans men, the way in which you are attracted to them could change to. Remember, nothing is set in stone. the way you are attracted to people now could change in 5 years or 15 but as people grow and change so do their preferences. It's ok to just be you as long as you don't actively hurt another person. this is an obvious and conscious effort on your part to not hurt others and that is enough for right now. I hope you enjoy the wonderful path you are leading and make many new discoveries along the way!