Circles exist or it's just an illusion

If we say a circle cannot meet/find it’s own end then does it mean it is overlapping itself and creating a spiral? Then how is it a circle it must be a spiral?

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From what I know about geometry, a circle can exist as a representation of a 3D sphere or spiral. There is no such thing as strait lines or plans in our reality, and the spiral is actually the only thing that exists