I lived in Oz for a few years so can kinda understand where you're coming from.
It's a great shame that your parents didn't really allow you to integrate when you were younger.
I spent a large chunk of my time there being horrendously homesick for the UK. When I married an Aussie, I left behind a good job, friends (most of which I have never been able to reconnect with as they were not interested - I used to write, send birthday cards and Christmas cards but never had anything back ) as well as a large, close knit family.
When I came home after my marriage broke up, everything had changed - I had to start from the beginning by building completely new friendships, as an ex Sunday School teacher in my local church, I was treated like a leper when they found out I was going through the process of a divorce. But I got through that and made a new life for myself and son.
Things have moved on and changed fairly dramatically since you left the UK and I think that you may be living on your parents memories, as well as yours, that may well no longer exist.
Australia is an amazing country- it has its bad points as well as many good points. It is quite unique in its lifestyle now- wages are really a whole lot better than here, completely different attitude for the hours you work - want to rather than have to, as it is over here!
Seriously reckon you are better staying put and concentrating on the good things you have rather than what might have been !