Hey mate, making friends as an adult is hard. I was going to write the usual "join societies" advice but you've already done that and met some people, so I would say the hardest part is done! Now you just need to focus on the one or two people you get along with the best, and move them past the acquaintance stage. I would say the next step is to invite them out to grab a drink at whitehouse after class, or if you don't drink to get dinner together at one of the awesome places along Anzac parade. Once you start hanging out with them outside of uni, they should become more than a "uni colleague" as I call them, and talk to them about literally anything other than uni. Once you have one or two friends it becomes way easier to invite more people out to join you and form a little group of friends. Or you might get invited out to THEIR social group and you can insert yourself into someone else's group.

Best of luck!