Why does everybody on here think I'm going thru a "phase" because I'm Transgender?

Everytime I ask a question having to do with me being transgender I get an answer saying I'm just going thru a "phase". I'm 14 years old (Male Body, Female Brain) and I've know that I was trans ever since I was born! I've always hated my genetalia and never wanted to touch it and used to pretend when I was little that I had a vagina and rub it (TMI, I know)! How could this be a phase if I've been like this my whole life? People make me mad! Your thoughts?