walk on me please

I guess I'm a doormat, I was complaining to Betsy about work and how I'm too nice, and she agreed, telling me she thinks I get taken advantage of all the time. I need to learn how to say no, and to evaluate my needs instead of everyone elses, it all sounds so Dr. Phil.

I need a skill, a career path, but what should I do?? I have this book that I take a bunch of tests and it is supposed to tell me what I'd be good at, I suppose I could crack that open and at see what it says.