Australia is not a continent...
There are many ways of thinking about that matter.
In the 7 continent model, Australia is a continent!
In any continent model in fact, Australia is a continent!
4 Continent model: Afro-Eurasia, America, Antarctica, Australia
5 Continent model: Africa, Eurasia, America, Antarctica, Australia
6 Continent model 1: Africa, Europe, Asia, America, Antarctica, Australia
6 Continent model 2: Africa, Eurasia, North America, South America, Antarctica, Australia
7 Continent model, As it is above....
So, Australia is a continent! And you are totally incontinent. Just kidding!