Fortunately, I solely have the pleasure of discrediting the race assumption
The word "solely" does some odd things in here, and few if any of the possible interpretations seem likely to be ones you actually mean.
Beyond that, your essay is solid, though it would be nice to see you go into more depth and to explore the issue with a bit more nuance. For instance, this seems overly simplistic:
In result of not obtaining a job, eventually that person is going to go steal stuff because they have no money which in the end brings some validity to that company's belief.
Not getting any given job isn't going to have this effect. Pervasive, widespread racial discrimination in corporate hiring policy might. But, really, you could look at more subtle ways in which this might work. So, for instance, if a teacher thinks Asian students are all good at math, might the teacher encourage Asian students more than others to pursue math and science courses, hence tending to fulfill the stereotype? If a teacher thinks African-American students aren't very good at academics, might the teacher offer less support and help to such a student who struggles in school than s/he might otherwise do. Also, you might look at how stereotyped people themselves decide to fulfill the stereotypes. So, if African-American kids see a lot of African-Americans portrayed as criminals on television, or in the news, might they not start acting as criminals, simply because, for better or for worse, most people try to fulfill others' expectations of them?