It depends on your perspective on "supposed to be". If (like me) you subscribe to the Christian worldview, then (in extremely simplistic terms) God is sovereign and everything happens for a reason. Which means I was "supposed to be" female bodied but feeling male, and now I need to figure out what to do about it in a way that is consistent with my relationship with God, and in light of an eternity in heaven where there is no more pain.
Based on my personal experiences, particularly within the context of my relationship with God, I believe my soul is male. I believe God doesn't "make mistakes" AND that our current world is "fallen" - meaning God allows birth defects to happen. Considering what we know about intersex issues, I think it is very possible that male souls could end up in female bodies, and vice versa. I find the argument that God "wouldn't allow that" to be extremely flimsy, particularly since there are many examples in Church history where Christians did or believed stupid things based on their unjustified opinions that God "would" or "wouldn't" allow something. Perhaps I will be proved wrong in the end, but if there is a gender binary in heaven, I believe I will be male.
Of course, people will point out that there are delusional people who think they are toasters. Or tigers. Or some ethnicity that they are not. That doesn't mean that's who God wants them to be. True. But my opinion is that this sort of an argument is a red herring. I think the validity of each component of your identity should be judged on its own merits. For example, take the difference between "When I grow up I want to be a painter" with "When I grow up I want to be a pedophile." Big difference. So it is with the difference between "When I grow up I want to be a man" and "When I grow up I want to be a toaster." If there is such a thing as genuine right and genuine wrong, then some natural inclinations can be celebrated, and some need to be repressed. Your worldview determines which is which. In the context of my Christian worldview, there seems to be nothing wrong with my male gender identity, particularly if no one can show me that "God wouldn't allow a male soul to be created in a female body."
In terms of how that affects my need/desire to transition, as of right now I don't think there is anything morally wrong with transitioning. However, as I explained in another thread (
https://www.susans.org/forums/index.php/topic,58248.msg368078.html#msg368078), I'm not sure that's the right path for me.
By the way, that's just from my Christian worldview. In a worldview where there is no God or no absolute moral standards, I think I would believe that your sense of self is in the brain, and you should do whatever makes you the happiest.
Oh... and I'm still thinking through this stuff. These are just my thoughts right now. I reserve the right to change my opinions. heh.
Joseph