My point is that the same mindset is available to others if they chose to seek it out. Telling yourself how poor and stuck you are precludes that.
Remember that the immigrants who come to america already have enough resources at minimum to immigrate!
... and are usually unable to do anything with that education because most American employers (outside the very unusual field of software engineering) discount or ignore non-American degrees. An immigrant with an engineering or medical degree making a living by driving an Uber in America is a stereotype very much based in reality. I personally know people who fit that stereotype.
Some people's circumstances are a result of systemic racism that has kept them from succeeding. Some people have been deliberately kept from better jobs, better schools, and better neighborhoods. Some people have consistently bad experiences from the power structure.
Possibly it could be argued that many of these barriers can be overcome in the modern age but that is a questionable assertion and the experiences of one's parents and grandparents is not easily overlooked.