Teary, as you are 22 years old, I assume in Australia that legal age to be considered an adult is 18 (or maybe even 21). Regardless, you are legally an adult, thus, if you are capable of giving informed consent, then they legally must ask you.

BUT, questioning your father is LEGAL, as it is covered by the freedom of speech. Questioning as they did is legal. However, proceeding to say that you see SARC and telling them of your conditions is a breach of confidentiality. I make the distinction because if you wish to inquire, one is legal, one may not be.

Before doing anything or contacting anything/one, ask for the paper(s) you signed. Read them, possibly get a copy (I assume they need a copy/original). If you signed something permitting them to tell a related family member (i.e. father), then regardless of how much you have told him, then they are legally permitted. But, if no such clause exists in the papers you signed, or nothing similar, then you have checked yourself then check the laws of Australia. If nothing is permitted there, then you may be able to legally do some action.

I don't know how it works in Australia, however, I am sure that there is a board to contact. Bring the papers you signed, your father (need him or else it's going to be harder and you'll quote someone not present, which likely would leave you nowhere, so bring the father and anyone else whom at that time, may have heard what took place). Get them to look over the policy to make sure, look over Australian laws, talk to the father and you. If all of that checks out, then you sit there, smile from ear-to-ear because you've taken the legal precautions and are in the right.

BUT, I'm not a lawyer nor a law student, so don't take what I say to be 100% true.