I have, and still am, struggling with this issue. (I'm 27, I fully came out to myself when I was 26) For me. It wasn't that I 'enjoyed' sex as a female, because lets face it, my ex was lucky to get sex once a month, and that was only if he badgered the HELL out of me. I have always imagined, thought, dreamed, of myself as a male, with male genitilla. Now, that's not to say that the occasional daydream of getting boned by Jared Leto or whoever the hunky was on my mind, with my girl parts, didn't slip through my head.
I have always hated my body. I'm big, as in big boned, I'm 5'11" I weigh well over 200lbs, and my breasts are (at last 'real in store' measurement... which was when I was pregnant with my son) 34 DDD. It's not easy. I have carried and delivered a child into the world... and honestly I can say that it was the hardest 9 months of my entire life. I hated it, I hated what my body was going through, I never, ever want to experience that again, but I would never change it for the world because I got this great little monster boy who calls me Daddy (no, seriously... even with the moobs and everyone else calling me Mommy... he defies them all and calls me Daddy). But, I can't help but wish that I had been lucky enough, as some here on the forums are, to have learned, to have caught myself, to have realized what I was... before all of that. Before a failed marriage, before being mentally and emotionally abused, before having my child. I can't help but wonder what my life would have been like.
And then, I come here, I see so many others who are on T, who have had the top surgery.... or who are just starting out, but they've known for years, they've been to the therapist, they've been binding and packing for years... and I just sort of stare at the threads and I wonder, I worry... am I trans enough? I wonder if I'm able to pass, if I'll ever be able to come out to my family (I'm already out to my friends and my sister), if I'll ever be able to be with my boyfriend (He's a gay man and lives several states away). So, yeah... I guess my point is, I worry about that all the time. I've never had a 'real' issue with my body. I mean, okay, I have. Because I absloutly HATE the way I look, the LARGE boobs, the 'child bearing' hips... and now that I've cut my hair short, I don't want to grow it out again. I love when someone calls me Sir on the phone. And it's those times, when I think about those things, that I sit there and say "You know what... I can't compare myself to other people, because I'm not anyone else. I am me. I am Talon Gage. I am a transgendered man. I am male. My body just hasn't caught up with me yet." After that, I'm okay.
Your journey is yours. No one can tell you if you are transgender or if you aren't. A therapist can help (which I so need to get one, because I have been in a depression like crazy with all of these thoughts recently), but they are just there to help you look within, to help you search out your feelings, and to decide for yourself if you are a man or if you aren't. But it sounds to me like, you're very much on your way to making that decision for yourself!
If you ever wanna talk, feel free to e-mail me or U2U/PM me here on the boards! I'm an open book!