I feel you on that Shane, I spent the last 12 years or so with absolutely zero direction or goals either dicking around or doing a crappy job with no prospects for advancement.
It wasn't until a year ago that I reached my limit, something clicked and I ended up going back to university. I'm still not sure that I've made the perfect degree choice but I'm definitely happier than I was and it's a hell of a lot better than miserably wasting away in an office.
Don't get too down over this stuff, there are very, very few people on this earth who know exactly what they wanna do with their life and even fewer people who achieve that goal. Don't feel like there's something wrong with you because you're lacking some direction, that makes you a perfectly normal human being.
And remember, whenever you feel at your lowest just go to the sink, splash some cold water over your face before staring closely at your reflection in the mirror and tell yourself:
"At least I'm not gata"