I was never really attracted to girls, but I didn't like boys back in those days either. I did like hanging out with girls, so I never turned down any of them that wanted to go out with me. This led to some confusing situations, one of which was one of my bigger mistakes: agreeing to marry one of them.
Luckily we didn't have kids; like Zoe said, sex is pretty much required for that. I was utterly disgusted by sex and you wouldn't believe the mental gymnastics it required for me. Women just.. women are awesome, but I'm just not attracted to them in that way, I'm sorry. When my wife left, she told me that two straight women don't really belong together. That was hard to argue with. It was difficult losing my best friend though. That sure feels like an understatement...
Being married did help me realize that being a man in this world was utterly impossible/ridiculous for me.
Once I dropped the nonsense, somehow I began realizing boys were pretty cute. This was while I was still married, long before HRT, but hormones accelerated the process of discovery on that front 1000x lol.