This is only a problem for you if you really want to work at Facebook for some reason.
If you were able to save a percentage of your income, then that percentage is going to result in a higher amount for the FAANG salary.
An example, is buying a house.. and rent pricing reflects purchase price.
If you buy and pay off a house, you have "spent" that salary in both locations. However, when you retire, you have property worth a LOT more in SV.
So while the "take home" pay, after expenses is the same with 150/400, the equity is massively different.
Your points about moving and college have nothing really to do with the discussion at hand - do they? If staying in whatever place you are is what you wanted then good for you. Many people don't like where they grew up or the people they grew up with. I'd also hesitate to imply that your experience with a high school only education and the employment opportunities that came up is going to be anywhere near common.
The points about moving and college are about people shaping their entire lives in such a way to be successful and meet their goals. The landscape might change a bit, but people don't stop being willing to hustle and adapt to the changing landscape.
I think probably the best thing that happened to me is I didn't have all of these mythologies about what I was allowed or capable of accomplishing drilled into me by the standard path that most people take. I imagine if you've invested your whole life in the understanding that the way to "make it" is to graduate from a top tier university and take a very narrow set of employment opportunities, it would be hard to escape that mental prison. But that's all it is. The hiring committees at FANG might reinforce that mental prison, but you don't have to deal with them. If you went the conventional path and got those fancy credentials, it's not like it will be harder for you to make it out here in the non-FANG world than it was for me. It'll probably be easier.