Convince me NOT to do Teach for America.

I've already accepted my offer but am still applying for other jobs. I like my subject area, but I'm just not 100% sure it's for me, yet at the same time am hesitant to pass this up. I already feel like I'm falling behind in the process because I'm supposed to be registering to take exams and start getting hired at schools.

I think I'm just worried I won't find something else.