I'm happy when my friends fail
I hope you're just kidding. Why are you happy when your friends fail?
Because that makes my world a better place.
It's rude to be happy when friends fail. You should want your friends to succeed.
But it makes me so happy when nothing is going right for them.
I'm not sure why nothing going right for your friends would make you happy, because that seems really disrespectful. You should feel upset for your friends when things are going badly, and feel happy when things are going well.