Luke, what Noel, Karl, and Patrick said. Few more comments:
* The ideal is to learn lots of basic math early in life, since internalizing it does take a lot of thought, practice, and time, and math increases what you can do and the sophistication of your thinking in general. But you can still teach yourself math later, with textbooks, Internet video lectures, and adult continuing education classes. And lots of exercises. If schools took advantage of young kids' brains to really teach math before age 12, while the kids are sponges for learning, those kids would be our new overlords, and no one could stand against them. But schools almost invariably botch the opportunity (at least in the US), so a motivated adult can catch up.
* You don't *need* math for most software development work -- most people don't have it. Or, the math that you do need, you pick up as you do programming, without knowing it's math.
* Working through HtDP is a good step in learning software development as an adult. Be aware that, if you want to be employable at the moment, you will also want to pick up a currently more popular programming language, like Python or Java. However, the popular languages to learn for immediate employability change over time. HtDP will help you to pick up Python and be a better Python programmer than many people without the foundation, and HtDP also help you to pick up the *next* popular language quickly. Perhaps it's like the advantage of getting lots of introductory math.
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