I'll tell you what I considered, when I was looking at this decision (in law school):
- Which classes I enjoyed the most in law school
- What type of lifestyle I wanted to have in my profession
- What the job prospects looked like when I graduated from law school
- What type of impact I wanted to have in the world; who I wanted to represent; what types of situations I wanted to engage in
It's typically expected that while in Law School you'll be spending your summers working at a law firm or in some other professional capacity. That's a good time for you to confirm your interest, but you need to have a pretty strong hypothesis before you start that summer associate role. The tough love: law firms expect their summer associates to behave like full-time associates, and they often hire from their summer associate pool, so it's ideal to do your searching before your do your summer.
Here's an idea: consider what attracts you to being a lawyer. Where did you hear about it? What drew you to it? Did you see it on television? Do you know someone who is a lawyer? Try to isolate what excites you about it, and then come back to us with a question that includes a larger explanation of your motivations. Maybe we can advise you a little more specifically. But you need to be clear with us about what interests you about law and motivates you to make it your profession.