You should get some salt and vinegar for that chip on your shoulder 😅
Nepotism will always exists, and some people will always be able to blag their way through life, but this is the minority.
I've never hired someone unintelligent for a high paying job, or given someone a promotion because of the way they look. Unless you're a model/TV presenter etc, this is fantasy land.
What I have come across is a lifetime of people stuck in dead end/entry level jobs who weren't willing or able to put the work in, who spend their time moaning about their face not fitting, or that everyone promoted ahead of them is a kiss-arse.
I remember taking an entry level job in my early 20s. Was promoted to department manager after three months. The person who trained me kicked off because they'd "been there for five years".
Yes love, you've been in an entry level job for five years...that's a you problem.