At one point, I didn't think I'd be able to continue with higher studies. I was considering to try pulling it off on my own with online resources, and I wondered too how that would compare to formal education in a university or an institute.
The internet is a fantastic resource, that one finds himself resorting to it all the time even while undergoing formal education. Khan academy is wonderful, but doesn't cover much over high school level of subjects (still great to brush up on your basics). I imagine that's because things are much more diverse, and its not a single linear stream of topics to follow as with high school. There are other resources like wikipedia and youtube, but the biggest hurdle in using resources like these is in finding a correct order of tackling the different topics. Anything can be very difficult if you lack in understanding a base prerequisite behind it, and it's not always clear when you're lacking that. Also, it happens that one sometimes fails to measure how much time and how they need to spend - and how familiar they need to be - with a topic before moving on. Another obvious problem with the internet is the amount of distractions contained within.
A lot of the above problems can be solved by sequentially reading an ebook on the topics you want to tackle, or watching a series of online lectures provided by some universities' websites on a related course.
A disadvantage of going online is that you usually can't ask questions or hear some other people's insightful questions. For that, stick to a Q&A site:
http://stackexchange.com/sites#
Maybe somebody would be able to give you advice if you say more about what you'd like to study and what for. (I remember you once said you like physics, but is a career in physics still what you're after?)