When you start work with your employer, you fill out something called a withholding declaration. Through this form you tell your employer about your personal circumstances and they use this to figure out how much tax to withhold to cover your estimated tax liability.
You may have indicated on that form that you are a non resident of Australia for tax purposes. If that did happen, your employer would be withholding a higher rate of tax.
To figure out if you are an Australian resident for tax purposes or not, see this information from the Tax Office website Work out your residency status for tax purposes | Australian Taxation Office (ato.gov.au).
If you think you might be a resident, ask your employer to fill out another witholding declaration, change this response and your tax withheld should change.
However, if you are a non resident then maybe the right amount of tax is being witheld?
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