Question

Hello,
I want to give an idea. Probably, it's stupid idea, but I can't stay quiet. So I was thinking that about wormholes and about how Einstein used rolled paper to show how it works. And then the idea came - ( still thinking that it's stupid) - that the Universe is round, just like Earth. And then I thought if the stars with their gravity create "lakes" in space-time then the stars like neutron-star or supermassive black holes could create so deep "lake" that could reach other deep "lake" and create a wormhole. So that is the question. If that could be possible? Thanks for reading.