Young adults come in all shape and form and it's really not as easy to forsee those who will do well and those who will struggle.
Some teenagers/young kids suffer with mental health issues for other reasons than lack of resilience.
It can be hard to understand why others, who have grown up with little hardship and plenty of support seem ro unprepared for adult life
My kids are early and mid 20s and both are completely independent. Both work FT, live in their own place, one in a studio, the other in a house share. Both drive and have their own car. I see and speak to them anything from once a week to once every few months.
Making sure they became independent from a young age was always at the top of my parenting priorities though. They walked to and from school before their friends were allowed to. They were able to use public transport, buses and train (short journeys) by the age of 10. They were alone at home every morning needing to get themselves to school by the start of secondary school. They were told they had to get a job as soon as they finished their gcses, which they did. They worked weekends during their A levels, and PT during Uni (400 miles from home). Both got very good degrees.
They arranged and paid for their driving lessons. I helped them paying half for their cars (12 years old plus) and first year insurance.
They got jobs within a few months of finishing uni and managed all their admin and financial matters afterwards, but would contact me for advice on rental contracts, council tax, insurance, pensions etc...
They both experienced some ups and downs, and found it hard at time. I feel I was there for them during these times, but coming home and offloading on me was never an option.
They are very well balanced young people, confident yet humble and happy.
Their friends come in all shape and form. One became a dad at 18, moved with his partner to raise their child. He was a very lazy unmotivated teenagers but parenthood has changed him. He is doing brilliantly and coping admirably.
Another had the absolute ideal middle class, parents together, great school, nice activities and holidays, but he's never worked. Went to.Uni, got a good degree, but he has done nothing I the two years he's left. Lives at home, not working, not driving, not going out much at all, won't do any small jobs or says he can't get any, has dreams of great jobs in London. His parents are purring no pressure on him at all and seem to just wait for something to happen. Maybe it suddenly will. He is a clever person.