I feel your pain, it's almost like I morph into some kind of alien that's been dropped here from another planet when I venture outside. I can't say I'm a girl 'cause I would be lying, I can't say I'm a guy 'cause I haven't been socialized as one, and I look and sound like a fifteen year old no matter what I do so how am I even supposed to articulate myself in the first place? Sometimes, even intrinsic actions as simple as greeting someone seem like they're not even my own because of my old habits, which brings my behavior at odds with my identity. I wish I didn't have to worry about social cues and mannerisms so much, IDing as trans is a lot easier on the internet because text is the only thing people have to judge me by. I had a heck of a time discussing everything with my counselor the other day because of that uncertainty; I know what I'm not but I have no idea what I
am, or I'm not yet comfortable outwardly identifying that way yet, which in turn makes my thoughts and feelings seem... illegitimate, I guess. I know that kind of thinking is bullcrap, but it's still lurking there in the back of my mind.
So yeah, you're not alone and don't be too hard on yourself. I know that's easier said than done, but I doubt either of us chose to be in this predicament. When I think about it, I never really went through puberty-not the proper one, at least, so maybe I really am fifteen (in a metaphorical sense) and my identity is just something I'll have to grow into and get used to as I move further along. While I can't really offer any advice, I can wish you luck on your journey toward transition and self acceptance.