I feel like...myself if I'm percieved as a boy?

All my life I've been a very nervous person, and felt different even though I did the typical teenage female things, like dressing in feminine clothes and flirting with the boys. That was when I was in 7th grade, and I'm in highschool now. I've secretly been attracted to girls all my life. I entered highschool, dressing like a girl, trying to keep up that role. Until one day I said, this isn't me, and put on my brother's jacket and chopped off my hair. I started chest binding and I finally feel close to right. Having breasts is something I hate. My brother was just kidding by calling me bro, and it felt so much better. Could I be transgendered? Just lesbian?