Is it worth going to college when you have no real passion for the subject you will study? I'm in my last year of high school and about to move on to the next stage, undergraduate programs. The problem is that I don't care about any of my subjects enough to continue them at a higher level. I don't have any of that love for my potential subjects that good students seem to have, which gives them so much motivation. 

On the other hand, there's no better time than after secondary education to get a degree. Should I suck it up, continue, and get a degree and better job prospects sooner? Or wait a year and spend more time to try to find something I would really like to study?

Quick note: The universities of the country I'm in don't do a liberal arts style (US style) education. We pick our subject before we go, then study solely that subject for 3 or so years.
Decision-making is a science, so I'll try my best to stick to the science instead of trying to push you into academia because, well, judging by the name of this place, I'm probably a bit biased. The extent of my expertise in the science of decision making is that I once read a book about the subject. Disclaimers out of the way, this is a short procedure for making a decision:


Make sure you know what problem you are trying to solve. Why 
do you want to go to university? A good job, living the uni student life, etc.
Specify what exactly you want to achieve. Do you want a
better salary, a job in an office, a job outdoors, learning to be
independent, living with young adults your age, etc.
Think of alternative ways you can achieve your objectives.
Have an open mind here.
Think of the consequences for each of your options. What
happens to you 5 and 10 years down the road? how certain are you of
those consequences and how can you reduce that uncertainty?
Make a table listing your options alongside all the pros and cons you can come up with during a week or so. Consider the respective weights of each pro. Do the pros and cons of option 1 cancel out, or do the pros outweigh the cons? Also try to put things into perspective. "Is 30k of student debt worth the pros of getting a degree?" becomes "are the pros of getting a degree worth X amount of dollars per month for X ammount of years?" or "are the pros of getting a degree worth living in a smaller house?". Be creative, but also be realistic.
Sixth and perhaps the most important step for your question, make
sure you identify the uncertainties affecting your decision. For
example, how sure are you that you won't eventually grow to like
your subject of study? Try to assign percentages to this. Can you
bear the consequences of not liking the subject? How much debt, and
what will that mean in your day-to-day life? Try finding new data to
fill these uncertainties.


Other general advice: 


Don't avoid the decision because it's complex. Avoidance often gives you the worse possible outcome.
Don't be afraid to change your mind in the face of new evidence. If after your first few months you learn or you get a gut feeling this isn't the subject for you, go through this process again.
Keep in mind the heuristics that may be at play, such as the anchoring trap, the status quo trap, the cherry-picking trap, the
overconfidence trap, etc.
Take your time. You would not buy a house after only a few hours of thought. Making choices when you are young is like steering a ship
when you've just left the harbor. The older you get and the farther
that boat has gone off-course, the harder it is to correct it, but
not impossible! But it pays to spend a few weeks, months or even a
year charting your route and getting your heading right. And if you
are completely lost, then you need data, and to get data you often need to
try new stuff, like joining the military to see if you like it.


There are many books about decision making. My comment is based on Smart Choices, by Hammond, Keeney, and Raiffa (2002) and Benjamin Franklin's letter on decision-making sent to J. Priestley in 1772. I also recommend Meg Jay's The Defining Decade. This is a much lighter read than the first book I mentioned, but it will make the consequences of your decisions clear, maybe even painfully so.

Godspeed.