I know exactly how you feel. I was a poli sci/communications double major and had always been planning on going to law school. As I was prepping for the LSAT, I started having doubts as to whether it was what I really wanted to do. I didn't know if I wanted to go to school for three years, let alone have to pull 80 hour work weeks once I was out.
I ended up deciding not to go to law school before I got my scores back (and they ended up being really good, so that made it harder since I could've gone to any of my dream schools). I was depressed for months because I was graduating and didn't know what I wanted to do with my life, and then one day I got a call about a job that I didn't even apply for. A few weeks later, I had a job in marketing. The people I work with are great and the job's working out well. It might not be what I've dreamed of doing, but LSAT scores are good for 3 years, so if I want to go back to school I can, and I'll have money saved up. I'm living at home with my parents for a while, so in 2 more years, I'll either have money to live off of in school (for a while, at least), or I'll have the down payment on a house.
Here's what I'd recommend. While it's easy for me to say this now since I have a job, I'd much rather work until I was sure that I definitely wanted to be a lawyer than jump into things. At some of the better schools, only 30% of the first-year students come straight out of college. Getting work experience doesn't hurt you at all, and many schools see that as a commitment to the program as opposed to an extension of college. Law school, and practicing law once you're out, is a HUGE commitment. If you're not ready to make it, take it from the poli sci/communications major over here, you'll find jobs in places you never expected. A lot of companies are looking for people with general "people skills" since they can train you to do whatever they need you for. Just keep an open mind and a positive attitude and you'll be fine.
Liz