Emma, most people who are happy in Aus don't tend to spend a lot of time on these forums. Whereas people who want to move back do.
Thats why there are far more anti-Aus, or at least unhappy -in -Aus posts here.
Give it a try, give it at least two years, and you will probably be fine. Unless you are super close to family and rely on them a lot. Then you may struggle.