How can people not appreciate life at all?

Im a pot smoker, i love relaxing, enjoying the sun, listening to reggae, on the beach, and just living life. Being creative. And etc. Just chilling. I just cant understand or get it through my head, how people can be so plain, always stressed, always bored, always angry with something, always complaining, like what the fuckkkk? Goo listen to some bob marley and look up at the sky, enjoy! And there always slamming things, and screaming and yelling. how can people be like this???? And one of these people is my mother. And its not like i dont have problems, i have alot of problems, i just seem not to care, and not let them effect me, i just brush it off you know.