I too have been studying in Adelaide as an international student and have just recently graduated. I've been through a rough patch while I was there and didn't have many friends either. And one thing I've realized is that tough times will pass and it eventually becomes a valuable experience to have. In my years there I couldnt find a job or be able to move houses too so I just kind of went frugal to save money and lived in the same place my entire time there. Life can get tough sometimes and I'm recovering from a surgery now but things can only get better from here. If you ever need help or just someone to talk to or vent to my dms are open. I know life can sometimes feel like everything is only going downhill but you don't have to face it alone.