You might have been labelled as a boy or a girl when you were born, but you feel like you should have been assigned the opposite gender. It's also possible that you don't identify with being a boy or girl or feel like your gender changes fluidly. This might mean you identify as non-binary, gender-queer, Xeno gender, or gender-fluid. If you're feeling any of these emotions, it may tell you, you would like to transition.
You might be uncomfortable dressing in clothes typically associated with the gender you were assigned at birth. You may feel drawn to spend time with people who are the gender you identify with rather than the one you were assigned at birth.
You may feel like you don't identify with the gender binary and would prefer to identify as neither a man nor a woman (non-binary, gender-queer, or Xeno gender). You might feel like the gender you were assigned at birth sometimes but also identify with other genders as well (gender-fluid).