I can honestly say I gave being a "girl" a shot. I went to the Military Ball in a very "old fashioned/southern belle" type dress, hair, makeup, ect, done and it sucked. I also ended up getting my period at that ball. Not a great time. I hid my period for a long time (I got it when I was around 16) before my mom figured it out and started leaving tampons and pads in the bathroom discreetly. Thank god for that. The puberty/sex talk after I got my first serious boyfriend (that I ended up marrying and am still living with) was humiliating enough, but even just wearing girl clothes came with a sense of WRONG WRONG WRONG. I would put up with it until I couldn't take it anymore and I'd go home and tear all those clothes off.
I'd seen shows about transmen, but they were all with women, so I brushed it off as "that can't be me, I'm not attracted to women" (this was before there was any light on gay transmen)
I hit on just being andro for the longest time. I'd grow my hair out, then cut it off, grow it out, cut it off. I finally ended up saying screw it, and just started keeping it short after I'd moved out of my parents house.
They just thought I was a tomboy and didn't like "girly" stuff, but I couldn't explain to them that that sort of the physically repulsed me, and the only reason I wore it/put up with any of it was because I was/am attracted to guys. It took a long time (and therapy) to realize that I was totally not a girl, and could play the game, but it wasn't me. Andro was looking better and better, and so I did that for a while, no HRT, just dressing more male than I already was, but everyone assumed I was just a butch lesbian, which, no offense, but I have no interest in females. It wasn't until I had some sort of breakthrough at like 3am in the morning researching androgyny that I realized transmen COULD LIKE GUYS and STILL BE TRANS.
That was a holy crap moment for me. I didn't look back after that. How could I? Going back to the farce of pretending to be a girl at this point, I think it would kill me. I couldn't do it. Nearly a year and a name change later, I'm finally close to being able to afford top surgery and I couldn't be more excited than if you'd gift wrapped me a 4x4 Jeep Rubicon and put it in my driveway.
But of course, as a young kid, I was interested in horses and dogs, and being slightly horse crazy probably didn't help the "not a girl thing" :p My mother is still in denial, because I never said anything to her about wanting to be a boy, or not being a girl, but I knew when I realized it that that was a taboo thing, and you didn't talk about it. Ignoring it in the hopes that it would go away was the route I chose.