The job I want vs. the job I need

I can't recall a time where I applied for a job because I wanted it, and not because I was in need of a job or a bigger paycheck. As a result, I have grown unhappy with every job I've had in a matter of months. I always feel like I'm stuck and I need to get out there and find something better. I don't know how to explain it, just a feeling like I should be doing better. I know I could do better, but I've never been sure how to approach getting a job I actually want. To be honest, I'm not even sure I know what job I actually want. I had to pick a major when I attended college, but the major I picked isn't something I can see myself doing for the rest of my life. The only thing I can see myself doing for the rest of my life is writing, and I'm frustrated with myself for putting my writing off. I have a ebook that's already written, I just have to edit it, but I keep letting things get in the way. From work to my own laziness. I managed to beat the new pokemon game this month, but haven't put in any real time writing. I guess I feel like if I had a job that I actually enjoyed everything else would fall into place.