Sti's in Australia

I'm 14 and I have unprotected sex recently and I've had a weird discharge coming from my vagina and it's been so sore and itchy, I want to get it checked out. 
I was wondering if in Australia I could get checked for an sti and get the medication without my parents finding out and all the information staying confidential? Also how much do you thing the check up and mediation would cost?

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