Forgive the term 'unlearn', I hate it.
But it did get me thinking about things I did as a child which I've changed now I'm an adult.
For me, it was never walking anywhere. In my family we never walked, even if it would have taken 5/10 mins we got in the car instead. I actually thought for a long time that a mile was a super unbelievably long distance that wasn't even walkable.
I now thoroughly enjoy walking where possible.