"things end up how they are supposed to"

that pearl of wisdom dropped out of someone's mouth today. i understand that- but what i dont know is how to not care in the meantime... how to not let my feelings and disappointments show. I know that everything that happens is leading up to another thing that will happen and it is all experiences and learning and what i dont get is why some people are able to bounce back up so quickly and some jsut get pummeled over and over and all at once.