You don’t have to be diagnosed to know that you’re nonbinary.
You do not need permission from professionals to call yourself trans. You do not need permission from professionals to call your gender dysphoria what it is.
You can go your entire life as a trans person without being “diagnosed as trans”. Trans people who aren’t diagnosed with Gender Identity Disorder or Gender Dysphoria are not less valid as trans people than those who are.
Doctors and therapists are not the arbiters of transness.
And, for that matter: you do not have to consider your transness or gender dysphoria to be a disorder or “condition”.
You do not have to medicalize your transness and you do not deserve to have your transness medicalized by others without your consent.
Trans people are the authorities on transness. Your are the ultimate authority on your gender and experience of transness.