Have you considered contacting headspace?

I know they do great work with people here in Aus.

Here's their link:

headspace National Youth Mental Health Foundation » headspace

They'd be my first recommendation.

Beyond Blue are pretty good too:

https://www.beyondblue.org.au/

Have you got a Mental Health Plan by your Doctor?

You're entitled to 6 visits to a psychologist that Medicare will pay for.

Then your Doctor will review your progress.