Title pretty much sums things up
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Both the Pacific and the Atlantic oceans are quite large and sailing technology wasn’t focused on such long voyages into vastly unexplored regions for the most part. Even normal sea voyages closer to the coast on known routes could be dangerous.
The areas that were closest are in the far north and the climate there isn’t very hospitable to large scale habitation or oceanic exploration.
So with little reason to venture out, the long time it took to do so, and better options, few if any tried to travel across for a long time. It was too far for accidental discovery too. When Columbus finally did try it was in part to do vastly underestimating how far the journey would be. Had the Americas not been there or been further west he might have been a curious footnote in history, a foolish voyager who took off on one way voyage.
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