What's the rush?

why are people getting married so young...no ceremony...and now no dress...what is the rush!?!? i understand people fall in love...i just don't understand why they can't wait till they can afford a ceremony, a gown, flowers, and the ability to rent a fabulous place to gather their friends, family and loved ones to celebrate their love TOGETHER! why is this suddenly a race to the finish line...since when is marriage something you do in a courthouse without telling anyone??? insurance purposes? SOMETHING??? any reason why this happens and i don't get to dress up for an actual wedding cermony??? please let me know because i just don't understand and won't until someone explains it to me!!!