There are a few ways out of it.
1. Identify a vocational interest you've had (whether it's electrical/plumbing work, or becoming a chef, or even something as far out as working on a fishing boat) and develop those skills through apprenticeship programmes and employment schemes and such.
2. Do some sort of Foundation entry programme into a more general degree pathway, or Access Course. Advanced Learner Loans exist for your exact circumstance.
But what we don't know is "what are you both good at, and interested in?" I suppose the best way to find out is to basically see how you do self-teaching a few interesting subjects, and discard the ones that are absolutely no chance until you've got a general idea.
If you're good at IT, programming is a good direction. If you're good at physics and maths, engineering's not bad. If you're good at biology and have a great interest in helping people, OT/nursing/medicine are decent career directions. If you find yourself best at tutoring your friends, then you might be a good teacher (as long as enhanced DBS doesn't show anything bad and you're okay with managing unruly behaviour, or work with older kids)
If academia's not for you and vocational work doesn't seem like your cup of tea, then you might want to be entrepreneurial and try your hand at e-commerce. And if worse comes to worst, you can always work on farms for room and board.