I was a total tomboy growing up. I didn't like girly frilly things (my mom bought me silk undies when I was 13 {because I was "a teen now and need to start acting like a girl"} and I was absolutely horrified) and all my friends were guys because they were just easier for me to identify with.
When I was little, I was pretty much off on my own playing all the time; I was that kid walking back and forth running her hands along the fence while the other kids were tearing up the playground. Apparently my parents thought it was sad and I had no friends -- I remember I just liked the feel of the chain fence bouncing off my fingers and I didn't want or need any friends. If I needed someone else to play with to make me happy I just went and got someone to play with.
I was told at 17 that I was a black man stuck in a white girl's body.
There are a few gender-guessing quizzes online that I took when I was late teens/early 20s and they all came back saying I was a guy.
Hobbies! So, I used to play a lot of sports (volleyball, swimming, archery) but I had to stop because my joints suck, so now I pretty much just feed my brain by studying stuff I find interesting all the time. I love celtic lore for its complexity and I'm teaching myself how to do chainmaille right now.
I don't read instruction books when learning how to do stuff like that, I like to just look at the pictures and deconstruct it in my head.

It's more fun doing it 100% on my own.
I'm also bisexual and poly. Jix, I think we just have a higher concentration of bi and gay girls in here. I know xSTP girls in person who are straight as straight can be.
