I actually wrote a super long TL:DR post in response to this question but decided nobody would read it or care so let me more succinctly try to add this.
I was never accepted into the world of boys and never looked or acted the part because that is simply not what I was in spite of the obvious contradictory anatomy. I entered kindergarten in 1960 and was immediately singled out creating major issues in my life until I graduated high school.
People had always been uncertain if I was a boy or a girl as long as I can remember and I grew up femme leaning androgynous looking but had the temperament, personality, manner and interests like any other girl which really seemed to bother and confuse a lot of these people. By 1967 or junior high/middle school (7th and 8th grade), the entire world including my parents and all the doctors I had been taken to from the time I was 10 pegged me as gay because of course at the time, that's how gender atypicality was categorized because no one knew any better.
At 15, while out of school a month recovering from a violent homophobic attack that darn near ended me, I came to an understanding with my parents there was no way in holy hell I was ever going to grow up to be a man and somehow they just got it. Even as ridiculous and unheard of such a thing was, they said they had always known my true nature and who I was. We knew nothing about trans anything and had no directions or guidelines to follow but I ever increasingly moved out of androgyny as sort of just a natural progression and by the time I was 16, outside of my freakish life as a non-human it in school, it was rare that people didn't think I was a girl. I only got more "girl" after that. After years of talking to clueless doctors, I was officially diagnosed with "primary transsexualism" and started HRT the summer before my senior year at 17 in 1972, which it seems was very rare for someone so young that long ago? Trans youth weren't even a recognized phenomenon nor had the concept of gender dysphoria come into usage yet and there were a lot of concerns about my age but nothing else made any sense. One of my psych evals even used some old Benjamin terminology when it was noted I was "completely psychosexually inverted". Whew! I'm glad at least the language is better these days even if things have gone a bit far in the PC direction.
Immediately upon graduation, even though I had been passing as a girl for several years, getting new IDs and stuff can be looked at as the end of my social transition but in reality, I had never been anything different to transition from so it was all a big non-issue. In other words, it was all kind of a moot. I had just grown up to be a girl with some sort of before transition and after transition point indiscernible because it all just organically manifested along the way somehow all by itself as the way things were just supposed to be. That sounds stupid, doesn't it but "being" a girl socially wasn't a big deal to me because that's what I'd always known myself to be and how I just came across to people. On the other hand, not being female and able use my body sexually as such nearly sucked the last bit of life out of my soul.
I lived the five years I had been on hormones and the four years since I had officially gone full time after getting out of high school in this sexual state of limbo. I had perfectly integrated, blended seamlessly into he world as a young woman and was completely accepted as female and was well beyond any sort of transition so when I did have SRS in 1977 at 22, you can bet that changing sex was all about being able to have sex at that point but it otherwise didn't have any effect on my daily life beyond the six weeks I took off work. Who I was going to have sex with was really irrelevant and it wasn't really until after surgery that I truly began to even discover what my preferences were. At now 63½, I still don't know what they are but it's been fun, interesting and sometimes hella exciting figuring them out. I've had my share of boyfriends and was reasonably promiscuous in my 20's and I was married to a wonderful man for 12 years but over the course of my lifetime, I've also had a couple of LTRs with other women as well. Go figure?
So no, sexual preference did not affect my "decision" to transition which was never a decision in the first place. It's just how I turned out. My sexual preferences did not did not lead me to surgery either but rather the ability to have sex as a female regardless of who I was with surely did.
Finally backing up what Complete said, people seem to think it was impossibly difficult to be trans, transition and be treated in the 1970's and the popular lore seems to be filled with nothing but horror stories from this era but if I got started on HRT as a 17 year old in 1972 while still in high school and had referrals and recommendations for surgery as soon as I turned 18, at least for me anyway, it wasn't as bad as people seem to think but I was pretty obviously "afflicted" and they didn't know what else to do with me but to proceed with what was considered at the time to be a grand experiment because of my age. Lack of funds was the only thing that made me wait until I was 22 for surgery, not gatekeeping. Yes, the way I was treated and some of the things that happened to me during my school years in a backward, redneck Arizona city are probably about as bad as you can imagine but after I graduated, with passing privilege I just easily got on with life with what we would now refer to as stealth as a regular girl and other than the sex and surgery thing, being trans was not and has not been a part of my life other than in minor ways.
