>>Says you, but my experience contradicts it.
Your experience is anecdotal. Surely you can understand why basing opinions and worldviews on pure anecdote is problematic, yes?
>>None of us are equal in any way, and none of us ever will be. You might as well decry the fact that some people are taller, or have an eye color that you prefer, or keep a head full of hair into old age. In a just (my definition of that word, not necessarily yours) society, we are equal in one respect alone: equal before the law.
Nobody argues that everyone is equal in terms of physical and personal characteristics. What is important however is for everyone to have equal opportunity. If you come from a well-off family who pays for your college, you are an order of magnitude better off than someone who had to take student loans. While you were studying for your classes and partying (or otherwise networking) in your spare time, they were working several minimum wage jobs. Similarly, after college, your job prospects will be better, not only because of higher grades (due to having had more time to study) but also parental connections, which may have landed you internships during summer breaks or full-time jobs after graduation.
If we move beyond anecdotes and look at the data, we see that it supports my argument. Do a Google search for social mobility in the USA and you will see that those who come from poor families are much less likely to proceed to middle class or higher throughout their lifetime. This is not because they are shorter or dumber or start balding at an early age, but because they did not have the same opportunities and therefore could not make as big of a jump as people who had better means.