OK - your dad is an MP and is from a rich family and my dad is an immigrant and works in a warehouse.
We both do PPE but I got into Oxford Brookes but you got into Oxford. This might have had something to do with all the stuff you did in your gap year and all the relevant work experience your dad sorted out for you. Meanwhile, I worked in a call centre in my gap year to fund uni.
At Oxford you know quite a few people - their dads are MP's too or belong to the same clubs, go to the same parties as your dad. You become the next generation of that circle. You marry in that circle, socialise with it, buy a house in Chipping something or other. You have parties, frequent the same clubs as your circle and your children get to know each other. And so it goes on.
Meanwhile, I have managed to get a public sector job starting on £17k but I've worked my way up and now I'm a manager on £35k. I can't afford a house in Chipping whatever on that so I live in Derby instead. It's a lovely area for my needs but a bit far for me to socialise in the same places as you.
We both have the same qualifications but you had more opportunities and connections. That's why you know all the MP's/newspaper editors/hedge fund managers/top civil servants etc.
Does that make sense? That's why people at the top are so connected and why there might be barriers for other people to break into that circle to get those jobs.