Ethnicity vs. 🍆Size?

So... This is gonna sound bad but I had to know.

I've only had any sexual experience with two guys and both were white dudes. One was my first and fit perfectly. The next was more girthy (like twice as much) and didn't fit at all (i really just am hella tight no matter what I do). Now I'm talking to a black guy and, well, I'm worried about how compatible we would be.

In your experience, is the stereotype that black guys are bigger true or is that a myth??