idk about where the money is but sys admin, especially in security if you can get a clearance, is not a job that can ever be outsourced or entirely handed off to automation. Some of the lower level processes in IT can and will be automated like some of the rote work you do in a NOC role, but overall we are not anywhere near a point where anything regarding security is handled by a nonhuman actor.
Sure there is money in big data. Depends on what your goals are. Can a corporate outsource to China and India for "big data engineers" anytime on the horizon that would include your career? Big data is the realm of A.I., machine learning and heavy mathematics, if that sounds like something you can do then you should.
Emancipate yourself and take out loans for a cheap local state or community college. If you're comfortable at home get any random job, start saving and use google. If you aren't the type of person who is motivated enough to use a search engine to access the infinite amount of free educational material on this subject than the field may not be for you, it is less important how you start and with what material than to start anywhere and not stop. Look into the basic certs and research them, there is also the cyber security thread on /g/ with guides.
Try to realize that you need to develop your own base level character as well. There are boundless opportunities and many free/affordable resources to pursue them, what is lacking in our society is the actual attention to put them to good use.
