Is it normal to not be able to run a mile?
Yep.Totally normal
Yes. Plenty of people can’t run a mile, and it doesn’t mean anything is wrong with you—running stamina varies a lot and can be built gradually.
Absolutely. A mile is a fitness goal, not a basic requirement, and lots of people would need to walk part or all of it. Your current stamina, past activity, health, and pace all make a difference.