Generally speaking, I encourage people to at least make an attempt at acheiving their dreams. If your dream is to be a lawyer, then the time to make that leap is probably when you're young, single, and don't have too many other distractions.
However, you should also be fully informed as to what acheiving your dream entails. If you go into law school unprepared for what lies ahead, you will likely end up frustrated and disappointed. Here's the deal: law school, for the most part, is not any more interesting or inspiring than economics. If you were bored as an econ major, you will likely be bored with most of the law school curriculum. Sure, you'll get to take interesting classes like criminal law, constitutional law, and maybe moot court. But you'll also have to slog your way through contracts, corporations, property, and civil procedure. In undergrad you can get through boring classes with a C by pretty much showing up and putting in some minimal pre-finals study time. You will not get a passing grade in law school with the same study habits. The amount of effort that got you an A in undergrad will get you a barely passing C- in law school. Seriously.
If you want to follow your dream of becoming a lawyer, go for it. But understand that much of what you think you will like about law is probably not quite right. A love of arguing, interest in social justice issues, etc., will not really help you too much. What you need to get through law school are discipline and focus. Law school is a marathon, not a sprint, and you'll need to commit yourself to becoming more disciplined about your study habits. Force yourself to go to class every single day, study every single day, and do all the reading. You can do it, you can get into law school and make it through law school, but you've got to reset your mind.
Incidentally, the vast majority of people in law school were not pre-law majors. I'm not even sure if most colleges offer such a major. Most law students majored in history, poli sci, english, etc. Most of your classmates will be high acheivers, and you'll have to compete with them for grades. The people I knew in law school who brought bad study habits with them from undergrad, those who procrastinated, and those who didn't pay attention in class were usually gone after the first year. Those who succeeded weren't always the smartest, but they worked incredibly hard.
Law school is doable, but you've got to force yourself to make an effort if you're going to do this. Good Luck!