Normally I would recommend you hunker down and try to write a program, or join an open source project, but since you said that you've had trouble teaching yourself I recommend you look for an unpaid internship. Every few months we take a few interns from high schools and colleges and start them off on basic projects which eventually evolve into more complicated ones. This gives you concrete goals while you learn new and interesting things in order to complete those goals. Usually you'll also have the benefit of collaborating with other interns in addition to asking the more experienced coders for help if you've exhausted all other options. We've found that most of the interns improve significantly during this period, it might work for you too.
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Normally I would recommend you hunker down and try to write a program, or join an open source project, but since you said that you've had trouble teaching yourself I recommend you look for an unpaid internship. Every few months we take a few interns from high schools and colleges and start them off on basic projects which eventually evolve into more complicated ones. This gives you concrete goals while you learn new and interesting things in order to complete those goals. Usually you'll also have the benefit of collaborating with other interns in addition to asking the more experienced coders for help if you've exhausted all other options. We've found that most of the interns improve significantly during this period, it might work for you too.