I'm 38 and single. If my job is making me feel like I'm wasting my life away, I only have $12,000 saved, what should I do?
For some people 12,000 sounds like a fortune. I say it's time for an adventure. Get rid of as much of your stuff as you can, get free of leases and other commitments, then buy a one way ticket anywhere, and then figure it out. Land somewhere you've never been, give yourself a ridiculously small budget, and figure it out. If you're inclined write about it. You might want to read My Life as an Experiment: One Man's Humble Quest to Improve Himself by Living as a Woman, Becoming George Washington, Telling No Lies, and Other Radical Tests. You might also want to start writing down ten ideas a day, a la James Altucher Confidential - Ideas for a World Out of Balance.
Or you might try something radical like bringing excellence and passion to your job. If you don't like it anyway, why not come up with ten ideas a day about how it could be made better, and then go to your boss and present the top ones at the end of the week. If your job really is a waste, come up with ten things you could do that would actually be worth your time and the company's money.
The thing is you could go out on an adventure or take exactly what you have and make an adventure out of that.
Oh and do the The Landmark Forum, an amazing investment in creating the life that suits you.