Where there's a will there's a way. If you really want to know theory on your own, you can do it. I really trust the "for dummies" book series, so I would look into that. There is a Music Theory for dummies. The AB guide to music theory, books, are really good as well, but you will need a music expertise to help you with that. Also, I'd check out Coursera, they always seem to have on line free courses about almost everything!