I'm sorry to hear things aren't working out for you and your roommates. Unfortunately, you are limited in what you can do since you have signed a lease for your apartment in Melbourne and that is a legal contract. Take a breath though, there are some options that are available and hopefully one will work out for you. First, if you haven't tried talking to your roommates, try that first. Sometimes problems are just a miscommunication that if you just discuss it, it could resolve itself. It may take a little work, but in the long run it might be a whole lot less than the other options.
If you've tried that and that doesn't work then try going to the Property Manager or Leasing Manager of the apartment community in Melbourne where you live and explaining your concerns about you and your roommates. They may be willing to either move you or your roommate/s to a new apartment within the community, that is, if one is available. Keep in mind, that even if you move, you will most likely still have roommates that you will have to learn to get along with as well as you could be charged a fee for transferring to a new apartment in your community in Melbourne, but you may get lucky and end up with roommates who are a better fit your lifestyle.
Next, if transferring to a different apartment in Melbourne doesn't work, you can try to sublease your room. You can either do that through the management office or on your own. This will assist you in moving out without still having to pay rent for your current room. There are some potential issues with subleases though. One potential issue could be if you decide to just have them pay you the rent and you pay the office that they could decide to stop paying, leaving you on-the-hook for the rent on top of your rent for your current place. If you actually sign the lease over through the management office at your apartment community in Melbourne to the new person, you could be assessed a fee for doing so.
Roommates are hard, so that's why roommate matching is so incredibly important and a lot of apartments in Melbourne offer roommate matching. To find apartments in Melbourne that offer roommate matching you can just use our easy apartment search guide on SunStateApartments.com in Melbourne. In the future, you can really work with your management office in your apartment community in Melbourne and tell them what kind of roommate you are looking for and what type of person you are and be as honest as possible. They are going to do their best to find the person that is going to be the most appropriate for your lifestyle whether that be the partyer or the diligent student. It will only help you in the future.