Advice on Career Decision for Myself?

I'm wondering how is it possible to not know what I should be doing with the rest of my life at 34 years old. I have worked as a cashier, waitress, blackjack dealer, personal trainer, aerobic instructor, mage therapist, telemarketer-and completed prerequisite courses to be an RN, but then got put on a waiting list. I have done well at most of the things that I have done, but always chase another job based on how well the pay is (or which is closer to where I live) Is there a process by which I can sit and yze my strong personality points and figure out what it is that I will love and how I can better society by doing what I truly love to do? I am a single mother and so it is imperative that I work (and I don't have anyone to support me) so I need income that is steady.