I'm with Jules on this one. All hope is not lost. Contact your local FE college and explain your situation to them. They have people and departments especially to help learners like you - people who have missed out on education for some reason and want to make a new start, either part time or full time. They can help you decide which subjects to take, as well as offering careers advice and support for when it gets difficult.
I wouldn't go for home study. It's a very lonely way of studying and you miss out on the confidence-building that happens when you socialise and interact with other learners. If you go to college, you'll probably be working with mature adults as well as school leavers, and that's a lovley way to study. You're also more likely to get your courses subsidised (or even paid for in full) by government initiatives, especially if you're under 25.