It's not your fault.

You are ready and you learned something....many never check the spare/donut

Live, Learn and move on. Nothing bad happened, no point in thinking the worst when the outcome was OK

Why does your Aunt get a capital A but your poor uncle only gets a lower case u?

If it makes you feel any better this is a routine problem and you shouldn't feel too bad about it. Yeah check your car but lesson learned, right. we picked up a horrible flat last week and just had to deal with it. Shit happens.