I used to have some similar feelings. I'm 5' and was assigned female at birth. Before transition, I felt I would never feel ok about my height and that it would impede my transition. Similar to you, I wasn't interested in being penetrated and fantasized about having a penis. I'm now several years into transition and have had top surgery and phalloplasty. Despite my height, I am read as male and feel pretty comfortable with my body. All this to say - don't let your height stop you from exploring who you are. As you say, transition is a lot of changes, so who knows how you'd feel about your body years in the future

It sounds like you haven't experimented much yet. Having sex, trying out strapons, talking about gender with a therapist are all ways you can explore. Gender identity is complicated and it's ok to not have it all figured out yet. Do any of the side effects of T sound appealing to you? How would you feel if friends or strangers referred to you as a guy?