The idea that I somehow received a special benefit simply because I am white doesn’t comport with my actual experience. I went to prison because I broke the law, and I was punished for it.
That isn't what people are saying, that can be true, and you can still experience what is called "white privilege" in that people that aren't white are much more likely to experience racist treatment from authority figures in the US than white people. It wouldn't be noticed because the system worked fine for you but not necessarily for most people.
There are many instances where you can see the system treats people unfairly especially those without money and people of color. Anecdotally and statistically I could go on for a while. Your experience alone is just one of millions. Just the sheer number of people imprisoned in the US is itself proof of the abusive nature of the US police state.