Uh, teachers have much higher job satisfaction than lawyers. And in some states, it's a better bet financially than being a lawyer, definitely. Science teachers are in demand. When you calculate what you'll make with a masters, the great benefits (including pension that eliminates need to save as much for retirement), and summers off, you're making more than an average lawyer. And there's no debt!
I agree with the other posters that you should wait until after finals to decide. What state do you want to work in? Check out teacher salaries. Based on your original post, I'd guess you'd be much happier in the long run teaching. I'd say start by taking a semeester off and exploring the other option.
Btw, if someone is thinking about trotting out numbers showing that lawyers make much more than teachers, then remember that the avg. figure includes a small group making a ton and the biglaw people working jobs that are difficult to get and brutal to have.