I can relate to what you say Bacon. I feel like I' m lying to people if I say "I' m male" because it might not be exactly what they are expecting. At the same time I' m lying to people if I say "I' m female" because it's not really either what they are expecting. Both for different reasons. Who is our true self though? Is it the spirit or is it the body? Saying "we're male", is lying to those who think it's the body, and saying "I' m female" to those that think it's the spirit. I realized lately that our true self is whatever form we take where we feel more free, comfortable and able to express our full potential. Posing as a persona that doesn't fit us is not only a disservice to ourselves, but also to others because we're taking away from them the "magic" that we could be offering otherwise. Most people will ultimately care about what they feel more than what they think, and what they feel is related to what they perceive. What they perceive has to do with their own expectations, experiences and to what we transmit, not strictly physically but with how we move, how we react, how we feel, the general "vibration" we transmit. I always recall this incident where I was in cosplay, waiting for something with the president of that particular series' fanclub. It's a costume I feel a bit self conscious about, because although the clothes are fine, I' m not tall enough (or at all), I have a different body shape, a different facial shape, and I can never fix my hair correctly (leaving aside the fact that I' m the opposite sex). However, she turned around and awkwardly said "It's weird but... I sorta feel like I' m with him (the character) right now". That was really strange (and self assuring), like, if I could look like him, there, I go and conquer the world right now. However, what did she perceive? what could I have possibly done for her to feel that way? What did she see that I didn't? In the end it's all about that, something that we transmit, beyond our physical form, that makes people perceive us.
It is for these reasons that I don't think we should focus on our bodies that much, just enough for us to feel comfortable, but we will never feel comfortable until we accept ourselves mentally. That's also why I don't like the terms FTM and MTF, and I prefer Transman and Transwoman instead. FTM is focusing only in the body, because what is it that it's female after all and needs transitioning? Just the body, since our gender has always been male. FTM focuses on transition. And when will that transition ever be complete? When will THE BODY ever be male? If we do everything that medical science can offer us? what if something new comes up tomorrow? It's a cycle that will never end, and we will always be stuck as FTMs then.
Now, as to how to "feel like a man", it's a problem that many cis guys have as well (they feel like teenage boys and not real men even though they are 30). And not only men, you also see in medical forums many students asking "when will I feel like a doctor?", you can complete medical school and not feel like one even though legally and technically you are. The answer is actually quite simple "ACT LIKE ONE, BECOME ONE". The thing is, you need to establish what being a man is to you, what a man does, and then do those things. Personally, and especially with the whole "feeling like a doctor", my problem is that I had too many examples of what "being a doctor" was like. That's BAD, focus on one. You go out and see 50 guys in the street, they are all different, they all do different things, then anything you do is "male", but that doesn't help. My advice then is to think of someone who you consider to be "A man" and emulate them, do what they do, try to embrace how they think if you think it's worthy. Eventually you will become them.
Good luck!