is it all worth it?

With relationships, it seems you just keep hurting yourself or someone else until you get old enough to marry. But surely if one of the reasons you marry is because you're at that age where you feel you're running out of time, you might have missed out with someone you previously loved and lost. Maybe they were the one you were supposed to be with forever but you missed out because you were too young? Maybe it's like in films, like The Notebook; if you're supposed to be with them they'll find you. Being young seems to put a definite maximum time period on things and by the end of it there's always one who is reluctant to go back to anything with that person, and one who would. It seems to me that no matter what you do, or who is there with you, you're on your own, growing in the world. I once got told "I'd love to be with you forever, but not yet. Only if we broke up first and got together again later on." I wasn't really sure how to take that. It was nice that he'd said he'd love to be with me forever, but at the time I saw that as meaning I wasn't good enough for proper ever, just for when we were old. I don't know. Despite being so young, you can love others more than you love yourself, and truly believe they are the person you want to spend your life with, but because you are so young, it all comes to an end when one of you realises. So then is it all worth it? All these random relationships where you fall in love and believe they're the one, and then get crushed?