those people likely got married too young or didn't think it through that much or suck at communicating their problems. if you want to marry, then marry. but be mature and know what you're getting into for the rest of your life. then it should turn out just fine.
none of this "it's not worth it" stuff. what does that even mean? is anything worth it? if it's something you want, then yeah you make it worth it. if you don't think it's worth it, then just stay in a relationship only. marriage is a piece of paper and 2 rings... we can delve deeper than that and say it's an enmeshment of two lives, yeah, but at the end of the day, it's still a relationship. just the government is now involved.