I'm 14 and I've only been in the habit of washing my hands after going to the bathroom for a year
Why didn't you wash your hands before that?
Nobody ever taught me to wash my hands after using the bathroom
Washing your hands after using the bathroom will keep you and those around you healthy. Washing your hands will prevent germs and illness from spreading.
Why should I care if others around me get sick? In fact, I wish everyone would.
Apparently you also need a lesson on why you shouldn't wish ill on people. With this attitude you won't be able to make connection with people. It's not nice to wish something horrible like that.