If you want help figuring out who you are, or what you want to do about who are, then I would suggest seeing a gender therapist FIRST.
What's your insurance like? Where do you live? You can probably google search for gender therapists or trans-friendly therapists in your area.
But if you already know right now that you want to take hormone replacement therapy (HRT), then I would suggest finding a trans-friendly doctor and asking them to tell you of a gender therapist who they would accept a letter from. since in order to start HRT you usually need to have a letter from a gender therapist.
And you don't want to be seeing a gender therapist who your doctor won't accept a letter from.
You could probably ask your family doctor if she/he knows of a trans-friendly doctor. if they don't, you could probably google search that too.