I went to private secondary school on a full fees scholarship.
I certainly know about the real world as we never had a penny growing up. I experienced significant trauma from when I was born til I left home at 18.
I started work when I was 12 and by 16 was working 2 jobs - cleaning after school each day and working in a shop on weekends. The trauma I experienced as a kid wasn't nice, but I'm not complaining about the lack of money - working from a young age was a good experience which taught me to work hard and has been valuable.
Many of my friends at school had money I could only ever dream of, but I didn't much care. I was lucky that all my friends were really nice. Money didn't matter in my friendship group thankfully, but my private school was a regular one, not for the super elite like Eton or harrow.
I never tell people I went to private school as I feel I'd be judged massively. No-one who knows me would guess really and it doesn't come up.
I had some advantages from my schooling, but nothing much more than I would have got from state education. I felt a bit the odd one out at times due to abuse and neglect at home, and stuff like homework being the least of my priorities. I drank and smoked at home from 11, which none of my school friends would have been allowed to do in a million years! My friends parents were, on the whole, lovely and very education focussed and would support their kids homework, extra curricular activities etc.. which was nice for them (and v different from my experience!) but it didn't turn them into out of touch snobs, it just gave them some security and resilience.
I'm sure there are plenty of privately educated kids - now adults, that were and remain massively out of touch with real life. But plenty are nice humans and plenty do know about the real world. Many of my rich friends were bought up to understand the world and to be decent, kind people. Many had lovely families and parents that simply wanted to do their best by their kids.
Please don't judge us all as toffs or being raised with a silver spoon. It's all a bit more complex than that.