Of course the factors you mentioned make a lot of this easier. And perhaps more importantly those factors mean that you're more likely to be forgiven for not doing the "right" thing. While those from less fortunate categories will be berated for ever having spent a single second not hustling
Sure - choosing good majors is important, if your parents can afford your school.
Sure, hanging out with the right people is important. Too bad they don't live in Minnesota, and too bad you don't have access to them.
You have little control over your parent's financial position, but you do have control over the major you choose within the schools available to you. Even within that limited pool, some choices are likelier to lead to success than others. Yes, the capital letters "Right People" might not be around in Minnesota, but there's still probably going to be different social groups to choose from.
There are things "in your control", but the prerequisites to having any control is based around the factors you've mentioned.
In theory even if your parents are super successful and the stars have aligned, you can still mess your life up. But at least you're given the opportunity to mess it up, instead of just being handed a shitty life from the outset.