How do you tell if your a transgendered person? am i say'n that right? I dont think its coming out right!!! ?

wel i can't say i hate be'n a gurl but i would like to be a man my friends al think i act like a man think like one and even when it comes to feelings i just dnt ues them like a gurl but my mom hates that i dress like guys how do i get her to understand?