Commerce is just the exchange of goods and services. If we all stop exchanging goods, in what sense would we have a civilization? What would you or anyone accomplish if you had to grow your own food, make your own clothes, build your own house…?

I don’t know if it helps, but this is not really a lie, and you shouldn’t feel bad about saying it. You have your own reason for not being able to do something you committed to. Someone else might have a different reason that is equally personal that they don’t want to share. “I forgot and I’m sorry” is a socially acceptable way to take responsibility without sharing specifics and potentially making someone else feel confusion or pity.

You can still work on the “why wasn’t I able to do the thing I felt I needed to do” without worrying about “why wasn’t I honest about my reason”.

Just my two cents though.

I suspect it’s worse than that: most people have multiple natural talents they never discover. That is why I encourage my kids to try all kinds of experiences, and not label themselves as “not a science person” or “not outdoorsy”. You don’t need to be good at just one thing.