Making a Living

My friend's roommate has gone back to change careers. She's gone into medical assistant school and I think she will be really good at it. I've thought about doing that a few years ago but my circumstances had changed and I wasn't able to. I'm not sure what career is for me, or even if there is one, at this point. I still would really like to start a business of my own but if I never figure out what to do that won't be a good thing either. I really need to get going on figuring out what exactly I want to do with myself before it's considered too late.