I can't really pinpoint exact hints as such in very young life because well, as a gender non conforming little girl my behaviour wasn't exactly "totally trans" because a LOT of cis girls are into dinosaurs and insects and trains and stuff right? And my parents just indulged my non conformity, embraced it. It was never a big deal.
however, I never understood girls. As in, I felt like social interactions with girls were a minefield of expectations and social cues I didn't understand and they all seemed to instinctively KNOW and it made me feel really outcast and wierd. Like an alien observing.
It wasn't till I fell out with literally every girl in my year over some stupid petty thing and started to hang out with the guys out of desperation and realised "oh wow... this makes sense!" those social interactions weren't so explosive, conversations felt natural and I felt SAFE and secure and less like I was having to fake it.
I HATED "girl" media and preferred massively the stuff marketed to boys. He Man, Transformers, TMNTs, Gargoyles etc. I adored them, but I knew they weren't "for me" which sucked and made me a bit self concious. I always felt like the media aimed at girls was saccerine and nauseating. I wanted action and adventure! But I don't think that's a thing unique to boys, gendered media is just stupid and restrictive like that.
In my writing the protagonists were almost always male and later when I started to rp I predominantly played male characters, even going so far as to outright state "I don't understand girls, how could I play one?"
I remember being utterly delighted one night when a girl i'd been chatting and rping with for months found out I was a girl was expressed disappointment because she thought I was "a really nice guy" and she kinda had a bit of a crush on me thinking I was male.
Okay I felt a bit bad that i'd accidentally misled her (she never asked me my real gender and we were playing in character!) but also DELIGHTED that I was mistaken for a guy. I saw it as validation that I could rp real good lol.
I tried to rp as a girl several times but I never got very far. Some sort of mental block stopped me, this subconcious "I can't get into the skin of a girl, I don't understand the female mind! it's all a scary mystery!" and it ticks me off because in my mind a good writer and roleplayer SHOULD be able to write both genders and my inner feminist insists guys and girls aren't that different and to claim as such is massively mysogynistic and wrong and yet... ARGHHH.. I just really can't get into the minds of female characters when I write them. There's a mental block that prevents me from getting comfortable in that skin. (Maybe it's dysphoria?)
Later I used to get SO indignant when people forced me to play a girl, I didn't want to and a felt so uncomfortable doing so. Rp was supposed to be my escape, a place where I didn't have to be ME. Being forced to play a girl upset me. I'd argue and get quite hostile about it.
If I ever had the oppertunity, i'd play a guy. It felt more natural, more correct, just... right.
My brain just defaults to male it seems.
Puberty was massively cripplingly traumatic to the point I preferred chaffed bleeding nipples to wearing a bra. Bras disgusted me, i refused to have anything to do with them till I had no other option. I resented them. Typically girls do NOT chose physical pain over bras...that is a bit wierd.
I have NEVER been able to "sit like a lady" as in, it's actually physically painful to my hips to attempt to sit with my knees together and as a result as a kid I was often teased for exposing my panties for sitting with my legs apart. So embarrassing. I dunno why though, I have always assumed it's something to do with the way my hips are shaped. Maybe I just don't have feminine hips or something.
And in my teens I began to describe myself as "a male brain in a female body" without realising how damn trans that is. I suppose i'd convinced myself I couldn't be trans because I didn't hate my body ENOUGH and because I didn't really understand what it was or that transmen existed.
I had no frame of reference but looking back? Me laughing with the guys and waving a hand all "well you know what im like, a guy in a girl's body right?" and we'd all laugh... How did none of us realise? Bah.
Oh, also the macho thing. I noticed this recently. Okay, so the cliche is that guys will compete when it comes to drinking and food, specifically who can eat the spiciest thing and who can eat the rarest steak or the biggest steak right?
I DO THIS! I never realised I did it but I do! Any chance to "out guy" the guys and i'm right there challenging them to an arm wrestling contest, it's ridiculous!
I suppose I was so desperate to be "one of the guys".
and to be honest, I have most of my life felt like "one of the guys" and find it extremely hurtful and dysphoria inducing when i'm excluded from things for being female or treated "like a girl". I get indignant and angry.
thankfully my friends are usually very good at treating me the same as all their other friends. I mean it helps i'm crass, sweary and rampantly bisexual so they never had to watch what they said around me lol. We used to have LAN parties and laugh at the jiggle physics of Dead or Alive Beach Volleyball which is such a horribly sexist game but SO AMUSINGLY stupid.
Ooo and the final one, which cracks me up a lot in hindsight. I went to visit my then boyfriend's family and friends and he introduced me to one of his friends saying "this is T, girls HATE T, not a single girl we've ever introduced to him has liked him so don't feel bad if you don't get along"
T and I spent the rest of the night chatting, laughing and drinking and the group of them were absolutely flabberghasted.
I haven't a clue why girls hated him, he seemed a perfectly normal guy to me but then, maybe i'm so engrained in guy culture that I don't NOTICE stuff that might make a cis girl uncomfortable? I dunno. But in hindsight it all makes sense! I got on with him because i'm not a girl! hahahaha.
A lot of me makes a lot of sense in hindsight, but then there's other things that don't quite fit that nice neat narrative but I suppose that's humans for you isn't it?