Get a job.

Get a job, earn some money.
Get a job, realize how rude people are in this world.
Get a job, realize how really stupid people are with the simplest tasks, i.e. ordering a smoothie.
Get a job, realize how customers don't care that they're taking up your time in being slow with making their order.
Get a job, realize how some people don't even know to pay at THE REGISTER??
Get a job, realize how you need some work on your own behavior around other store workers.
Get a job, realize that there are only a few truly generous, kind, friendly people in this world, esp. to strangers.
Get a job, learn to be patient and tolerant.
Get a job, learn to be independent
Get a job, learn some manners.
Get a job, learn to be courteous.
Get a job, learn to make eye contact.
Get a job, learn how great giving and getting a "thank you" is.
Get a job, learn some human decency.