Hi Liam ,
A big Aussie welcome to Susan's family. It's good of you to drop in and say "Hi". Hope you like it here, and you stay for a while.
There is a mountain of information, resources and friendship waiting for you here, you just need to jump in and start talking.
College is a good place to start your journey. There tends to be more acceptance there than most other places. Your student counselor may be a good place to start asking questions about gender issues. If they can't help, they should know counselors who are versed in gender issues. Also, they may know of groups that you interface with and start a support system going for you.
Looking forward to hearing more of your story in time to come, but in the meantime, be safe, well and happy.
Lotsa huggs
Catherine