I had an inkling, as I think most people do, even the people who most benefit from the status quo. But, being born white and male into a middle class household granted me a tremendous amount of privilege to avoid ever having to see it too closely, without even trying very hard. Having been exposed to technology at a young age, and encouraged in that pursuit, granted me a near complete lack of need to actually work all that hard to survive. It's easy to believe in a meritocratic society when you believe you're meritorious enough to deserve all the good things that happen to you and to avoid all the bad things being inflicted on others.
Let's just say I've grown as a person over the past few years.