Coma 17
I'm from Melbourne as well, and if you read all of this thread you'd realise that skin colour is a non-issue.
All they care about is how much money they can fleece out of you.
Keep your eyes open and you'll have a great time.
Enjoy the sun and get a great tan.
I'm from Melbourne as well and the sun isn't nearly so bad in Thailand as here but you will still want to wear a hat and sun-protecting clothes and use plenty of sun screen when you're out in the sun.