More along the lines that I didn't get a black belt when I had hoped to.
And you've been whining about it ever since... Let it go.
Your white belt must be getting dirty since you've had it for so long and used it so much, it might even be turning black.
You may have noticed at some time in your life that dirt isn't black...
If you don't wash your belt, it'll turn a sort of dirty gray/brown with maybe some green mold and fungi if you sweat a lot or live in a particularly humid locale.
And yes the black belt does turn white over time, and that's a sign of true experience, a black belt with the color coming off with use that is going to white.
I guess I don't have any "true experience" then, since I wouldn't wear a ratty belt any more than I'd wear a ratty dobak.