Zoe,
Mine is a similar story. A few months before I had actually pinned down the cause of my feelings, I started wearing tighter clothes, growing my hair out and wearing makeup, and looking as androgynous as possible. Mannerisms and dialect changed on their own, and I had no idea what to think. Everyone told me I was a gay man, but I knew I didn't like men, nor did I feel like a man at all, so I didn't know how to identify myself. It definitely paid off once I figured everything out; I have hair that's a decent length to pass, and the transition doesn't seem so "sudden" to everyone since the men's clothes I wore are similar to the girls' close I wear now.