Financially speaking, how do people even cope?

My partner and I are moving. My new job will be paying $100,000 which I thought was a lot. My partner in the meantime will take a bit longer to find a job. So, for the first time, we will be living off of my income alone for the foreseeable future. I have just crunched the numbers and WOW! 50% of our income is gone with just rent alone. Then of course, there are groceries, fuel, electricity/ gas, internet, phone plans, insurances. There's basically nothing left when these are factored in. I'm completely shocked.

I had always thought I was on a half decent income. I know many people are on a lot less than that. How the hell are people surviving in this country? Do single income households even exist anymore? Can mothers no longer take time away from work to raise children? What is happening in Australia?