That being said, and thats only my experience, for those who have always "felt like a boy/guy", explain exactly what that means. How do you feel like a particular sex? And before anyone says they as a female feel "masculine", explain how you feel like secondary sexual characteristics.
Edit to add: If you are not legitimately answering this question, describing how it feels to be a "boy", do not respond. Only legitimate answers will not be deleted. And any response saying you thought you should have been born with AB and C will also be deleted because that describes what you would like to have possessed, not how you "feel like a boy". Boys do not wish they had a penis or wish they could pee standing or grow up to have excessive facial hair, they already know they do and will.