Hello Kirra, welcome to Susan's!
I am so glad you have joined - I have found the community here incredibly helpful in my transition. I am also MTF, I live in the US near Seattle and have traveled to Australia several times but never made it to Adelaide. Here on Susan's we are all in the same neighborhood. I have encountered many of the same things you describe.
I'm glad you are seeing a doctor and a gender therapist, and getting a health plan with transition in mind. I am totally unqualified to make any sort of medical diagnosis of course, but I think it's possible you might find an HRT prescription reduces the need for antidepressants - just something I hope your doctor takes into consideration.
If you are almost 20 and your Adam's Apple hasn't grown much I don't think it will suddenly begin growing quickly. I bet you still have some time. The main thing is relax, get more comfortable with yourself as you are discovering your true self.
As you become more comfortable with yourself you might find it easier to solve your job hunt. I know gender presentation can add a challenge with some employment situations, but the overall impression you want to communicate is confidence and the ability to be your best - and it is so distracting when you can't truly be yourself. I was never completely comfortable presenting myself as the wrong gender all those past years. For many of us, presenting somewhere in the middle of the gender spectrum can also work quite well as a temporary/transitional or permanent solution if you are happier that way. Just some things I have discovered worked for me and I hope might help assure you.
We always provide the following information to new members, and I will add it here for you.
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Kirra I agree with KiranFox - you are definitely in the right place here on Susan's. Great to see you here!
Kendra