What 'faerii said. Also, relationships at extremely young ages have to change radically, as the individuals in the relationship grown and change themselves. Until you know who you are and what you need, relationships have the potential to be harmful, not hurtful. Once you're clear on yourself, your goals, the points you won't compromise and the ones you will, then relationships become an option. For example, I personally don't think that attempting serious relationships while taking a heavy course load are a good idea at all--I never have enough time for me, much less another person.

Eventually, people will mature enough to realize these things; and the benefit is, once you've gotten yourself straightened out and decide to figure things out, your judgment for compatibility with another person increases. My parents were married within 2 years of their first meeting, but they met in their mid thirties and knew themselves well enough to be able to figure out pretty quickly that they would work well together as spouses. They also talked out things like their expectations, children, home ownership, etc., before they committed, and it's made for a pretty good marriage from my perspective.