I am always amazed (and not in a good way) at the abundance of people whose first response to any challenge is "I can't..."
To paraphrase my mother, "If you start out with 'I can't' you certainly can't." [She actually used to say "Cain't never did nothing," - she grew up in the deep south...]
As kids we weren't allowed to say I can't until we had given it our best attempt, at least a couple times. It's not that my parents were task-drivers, or harsh; they were very caring and supportive. They just would not tolerate a defeatist mindset. And the result of that was that all of us kids – and most of our kids – are very well equipped to take on the challenges the world throws at us.
I think all the "I can'ts" would benefit from living with my mother in their formative years.