You have to be optimistic, that was what a QF Jumbo pilot told me, many times. More piltos than you think are probably in your situation, and the the QF pilto told you, getting a CPL with IR at 19 is an advantage, but dosent garuntee anything. I suggest, getting your hours up in any way possible, and come back home, but Apply for the airlines first. no point moving back and finding that you wont get accepted!
GA jobs that might get your hours up are also a good thing to get into. Maybe even look at instructing, Scenic and other GA flying in Australia might get you home earlier, but once again if you dont have the Euro Low Cost Turbine aircraft Hours, theres a greater chance you wont get into a job! You need to thouroughly research your options, and be critical of yourself, and think of the worst situation possible that you might be able to get yourself into. Be Prepared. If you play your cards right, you'll be home in no time
Like the others said, You can do it, no one else can tell you otherwise!
Daniel