Why your Stomach acid do not effect on stomach though it is strong enough to dissolve thin metals?

Image credit: Britanica.com

Our stomach's Parietal cells secrete hydrochloric acid (HCl) into the stomach's lumen, or cavity. The solution in the lumen may have a pH of one or less 10 times as acidic as pure lemon juice. This HCL is essential to digest food. 

 But amazing fact is that this hydrochloric acid with a pH of 2 to 3 and it is highly corrosive. So this acid is able to dissolve thin metals, like blade, copper strip etc.

But more interesting things is that our stomach  do not effected or burned with Stomach Acid (HCL). Do you know why is it possible. 
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