Yeaaah, at some point you're gonna have to start formulating *and meaning* sentences like "I need to study X because I want to work as a Y". If you have no earthly idea of what you want "Y" to be, you got a lot of thinking to do. I guess I'd start with lists of careers, imagine yourself working at each one (and not just the fun parts), and think if that's something you could stand doing 8 hours a day for dozens of years. Cross reference that with some idea of the job openings and demand in your city and nationwide for each field - you might love making buggy whips but good luck getting one of the handful of those jobs left in the country.
"YOW how will I find out that kind of stuff" - well start with google, but librarians in actual physical libraries often can put you in touch with published info. Also the colleges should have couselling offices, or career placement, or whatever they call it. Some are pretty good and some will suck - be a little wary of the for-pay schools giving you too rosy of a picture of the prospects for grads of their courses, but hey it's a place to start. Ideally go to several, especially at local community colleges. They should also know supply and demand for grads of their programs, and who's hiring them. Are those places you want to work?
Try to take some of the career aptitude tests, back in the day I think my school gave everybody the Kuder brand test, and it spit out a ranked list of careers supposedly suited for you. (They were actually pretty spot on in my case) Now that list is not the law of the land, but it's definitely a decent place to start especially if you have no idea of what's out there. The counselling departments SHOULD have that kind of stuff, I'm sure there's some free online but try to take at least one of the pro versions, for one thing hey'll be something the counsellors are familiar with so it'll be easier to talk with them about it.
Then if it was me, I'd start going to job fairs and seeing what's in demand, talking to the guys in the hiring booths, and even contacting the bigger/more pro employers. Ask THEM about their needs, what qualifications they look for, what they think of grads of that program at College Z that you're looking at, etc. Do I really need a degree? Is there some shorter courses with certification? What's the next steps up after entry level, what does it take to move up, etc. If you're in or near a reasonably big city look on places like meetup.com for groups that profession X will be likely to go to - go to some meetings, buttonhole some of those guys and ask what their day to day work is like, how to get started, what the career paths are like, what parts of the job suck, etc.
Yeah, I know it sounds insane - initiate conversations with a bunch of people you don't know - eek! Track down information, etc. But the payoff is finding something you like to do that pays well and is in demand... And yea it's still not gonna be like every day on the job is a trip to Disneyland, there's a reason they have to pay to get people to work, you have to find a compromise you can live with. And hey, if you find you can't stand job Y, at least (hopefully) you made some money and now know better what you really want...