I use certain common labels, but mostly for convenience. I don't like the term FTM, but I do use it because people know what I mean. I use the broad term trans and the more specific term transsexual. I consider myself a transsexual because I know that I was assigned female at birth and because I once lived (at least in the real world) as a girl and a woman. Ugh. I hate to even say it because it was so wrong for me. So I'm a transsexual because of my birth labeling, my history, my life experiences. I'm a transsexual because I wasn't given the opportunity to self-define from my earliest childhood on. I'm a transsexual because that's the most convenient term to describe people like me who have had similar experiences.
But I do not have an FTM identity or a trans identity or a transsexual identity. I'm a human being and a gay man and an American with certain religious, political, and social beliefs. That's my identity.
Being gay is a strong part of my identity. It has been ever since I can remember, even before I understood what it meant to be gay and even before I fully understood that I was gay. I just knew that I was M4M identified ever since I was a little kid.
I fully realize that I'm also using some binary-appearing labeling here, but I recognize a spectrum of gender. I'm just way down at one end of it. And as for sex, well, don't get me started.