We think we are defined by what others think of us, but what makes you an amazing person is how you see yourself, not how the world sees you. You can't live your life by the approval of others, just express yourself, and find who you are alone.
I have many friends who identify as the opposite gender, and they seem to believe that they will only be a 'real' boy or girl if others refer to them with the right pronouns and respect them. But unfortunately you can't demand respect and acceptance, normally it must be earned. Even if you are the only one who uses the right pronouns for yourself and refers to yourself as the gender you wish to be, you can't give up on yourself. Not everyone will understand, but as long as you stay strong things will always be okay. Be who you want to be and never let anyone change that or try and tell you you're wrong.
Even if you don't think you pass as a boy or girl and even if it feels like a constant battle, people will be here for you. But most importantly, you must be there for yourself when no one else will. Gender and sex are extremely different, you are not defined by what is under your clothes, always remember that. We live in a society where being transgender is accepted, don't be afraid, you are not alone.
I can't give any true advice other than you can be whoever you chose to be. Never be afraid to express yourself and don't feel you have to be trapped in a body you hate.