Irrational beliefs come from "mustabatorythinking" -> Thinking that certain ideas/assumptions MUST be true in order for an individual to be happy-
• I must be approved or accepted by my friends. • I must do well in the test otherwise I will be a failure.
• I must become a doctor or my parents will be disappointed. • The world must give me happiness and be fair.
• For example, it's not failing the exam that triggers the depression (otherwise, everyone who has ever failed an exam will develop depression).
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Instead it's the irrational mustabatory thought (that is within the individual person) of "I must do well otherwise people will think 1 am stupid and 1 will never be successful"
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Not everyone will have this type of thinking, hence why not everyone would develop depression.