With the exception of those born into money, everyone* get's the same opertunity to do GCSE's, then if they've shown some aplitude for learning A-levels, then a degree if it suits them and their plans. So at some point allong the line everyone through judgement or luck** has made a set of decisions which landed them where they are today.
Problem is people don't have the same chances in life, if your born into an environment where you are expected to do well and are pushed you have far more chance than someone born into a different environment.
In the current climate with ever increasing us of interns, being born wealthy and living in london places you at a huge advantage over those born to northern working class parents. If you want a career at the bar try funding it without money, why are so many doctors children of doctors?
I am not saying you can't make it but anyone who thinks background is a minor detail is very naive.