This would remain one of the unsolved mystery in the world. No one can say for sure about who owns most wealth or assets in the world. The best that has been is the Forbes richest list and is also the most accepted. Let's just stick to it before some people level of wealth leaves you pitying your meagre financial pay.
there are several versions that say the richest people in the world, and each version mentions different people so the certainty is that we don't know.
It's better if we don't need to think about things like that because it can make us feel sorry for a little money as you say, but if you can deal with it well then something like that can be your motivation to be more advanced. What is clear is that we must continue to be grateful for what we have today.