Whissper,
Aviation is not for pesimists, its for optimists.
The glass isn't half empty!
If that is your attitude don't bother in this industry, we are the first sector to feel the pain when anything happens globally and the doom and gloom mentality you have you wouldn't make it very long at all!
On another note who have you tried if all you have tried is Qantas and Virgin you have not tried very hard at all.
I have seen some peopele post on this web site they have applied 3 or 4 times to qantas and still not got in!!
Have you tried John holland if its the bigger stuff you are after?
What about GA companies Australia has many of those.
You really must choose mech or avionics you can't just say oh I will take what ever, sounds like you don't know what you want to an employer not a good look.