I'm located in Melbourne and I'm similarly trying to get into more of the gym culture not just over forums.
If you're looking to meet likeminded people who are into bodybuilding or the gym, your best bet are more bodybuilding centric gyms (One Gym, Doherty's Gym, Powerhouse Bayswater, In2Performance, Next Level HQ, Muscle City, HUSLA Gym, Iron Kingdom, Emerge Gym).