Why do we feel immense pain only when our brain tells us we are in pain. But we really aren’t? ?

Why is pain unbearable and agonizing when people feel it, they technically don’t really feel it because atoms don’t touch, but also their brain is only signaling there is pain. By the nervous system/ nerve receptors. So why do we cry or yell when in pain or even faint from shock? Shouldn’t we remain composed and simply handle the situation? This doesn’t make sense to me as to why people are this way.

Why do we feel immense pain only when our brain tells us we are in pain. But we really aren’t? ?
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