When have you actually had to realise that you just were not good enough?

It may have been a sport , a job , a situation..

When have you actually had to realise that you just were not good enough?

How did it work out?

Updates
3 mo
I think for me it was Golf , I was such a keen player and not a bad player , competing in every open event I could , they say " practice 15 mins longer " But bottom line was , I ain't goin to the US tour ( sadly ) .
When have you actually had to realise that you just were not good enough?
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