Good luck on the interview I'm sure you will do fine. They basically ask you questions about being willing to work outside in all weather conditions and a few how would you handle upset customers questions. If you have ever done delivery before you should get through them just fine. Let me know how it goes and good luck.
I think a lot of 20 something kids grew up knowing they could always quit a job because mom and dad give them rent free living for however long they want. At Amazon I would always crack up when a bunch of 25 year olds rolled up in fancy sports cars. You ever check out the reddit page AmazonDSPDrivers? So many complainers.