I never got very good at pretending to be a guy. Aside from 3 years in high school when I was trying really, really hard, I've always looked, talked, and moved more like a girl than a boy. Between that and the depression, it was pretty clear something was wrong with me. So when I came out the majority of folks weren't particularly shocked.
My dad was the only one who was really surprised, but that was expected given his general obliviousness. But he's worked with trans students in the past, so he got it right away at least.
Telling my mum was entirely underwhelming. She'd already guessed a few years back apparently, due to an awkward conversation where she AGAIN asked me if I was gay, and I said "I wish it was that simple. That would be easy." So I guess I'd tipped my hand.
My sister already knew, I told her a good 6 years prior, so it was more of a confirmation that I was going to do something about it. My best friend was taken aback at first, but moved quickly towards "well a lot of things make more sense now."
Actually it was my sexuality and style that caused more confusion. Apparently it was easy enough to grasp "I'm a girl," but "I'm a tomboy who likes other girls," not so much.