It might be possible to argue bullying if you are being treated differently to other workers in order to humiliate you or punish you for something illegitimate, and this could apply to situations where you are unfairly excluded from consideration for promotional opportunities, etc. It may amount to discrimination if you are being treated differently for reasons of race, religion, etc.
You can read more about bullying and discrimination here:
However, such claims can be difficult to prove unless you can show a pattern of behavior and its intent. To that end you should keep a diary of any matters that support your suspicions and if possible keep copies of any communications or emails you receive that indicate the occurrence of such behavior and the motivations behind it. It may also be helpful to query in writing with your employer/manager why others seem to be getting preferential treatment. Their responses to such questions can be very informative as to their motivations and if the motivations are improper, such a question can sometimes evoke a response which confirms such suspicions.
If you can gather compelling evidence that your boss is treating you unfairly then you might have the basis for pursuing action either before the Fair Work Commission or a court, but you have to understand that your case needs to be compelling to have a good chance of succeeding, and that either way you will likely be damaging your relationship with your employer once you take such action, and if unsuccessful, it may lead to your termination.
I trust the above assists your understanding.
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