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Your stomach lining renews itself so often that its cells almost never last long enough to be damaged by its own acid.
Stomach lining cells are replaced every few days, a fast turnover needed to repair constant damage from the stomach's own highly acidic digestive environment. Cells sticking around too long would eventually be damaged by the acid meant for breaking down food.
A ten-year or once-in-a-lifetime cycle would be far too slow to protect against that corrosive environment, cells exposed to so much acid need frequent renewal, not rare replacement.
This rapid renewal, alongside a thick protective mucus layer coating the lining, is why the stomach can digest food without digesting itself.
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