does wide feet = larger/thicker dick?

No. Do a person's feet determine the size of their ears and nose? Same type of relationship.

No. Feet have gotten wider as people have gotten fatter, so there's some correlation with wider people in general. Bone structure in general has no correlation afaik, and there are plenty of whip lean skinny guys packing really big cocks.

In my case I'm a lot above average in one and about average in the other.

I'll leave it up to your imagination which is which.