Children and young people were much less protected and supervised in the 20th century than now. Partly life was probably safer as most people knew their neighbours and looked out for each other a bit, in towns and villages anyway -- cities were probably freer and riskier. But partly kids were expected to look after themselves more.
There were few organised activities apart from Guides and Scouts, as children usually played with their friends or neighbours' kids, in local parks or in each other's homes, and came home at tea time. Several children I knew were 'latch-key kids" whose parents were both out working, so the children let themselves in when they came home.
I walked to and from primary school on my own in the 1960s, and I remember one day going home for lunch, then walking back to school a bit late, so the playground was empty and no one heard me trying unsuccessfully to open the big heavy gate. In the end I had to walk back home and miss the afternoon's classes.
Most people I knew left school at 15 or 16 (school-leaving age went up to 16 in 1972) and got a job straight away. They didn't earn much, but most still lived with their parents and gave their mum a chunk of their wages. Weddings were important celebrations, then as now, but for most people it was never on the scale that's seen now. It was usually a church ceremony, then a reception in a church hall or community hall catered by the families or a bakery, with a local band or records for dancing. Not the equivalent of six months' wages!
I believe food was the biggest expense for the average household, though people rarely ate out or bought takeaways. Families didn't spend a lot on holidays or clothes. Heating was expensive so, in many homes, only one room was heated, by oil or gas or an open fire. You dashed upstairs to bed with a hot water bottle!
It was easier to live on the low wages most people earned in those days, as expectations were much lower, and, as they say, "we made our own entertainment". We didn't feel poor because everyone around us lived the same way.