Don't think of yourself as a kid. As long as you have the algebra background, you can learn CS from the same resources as anyone else. How you go about studying

Don't think of yourself as a kid. As long as you have the algebra background, you can learn CS from the same resources as anyone else. How you go about studying CS really depends on your situation and learning style. Does your secondary school/sixth form (I'm guessing you're British from your writing style, else high school) offer computer science courses? If so, I'd highly recommend you take them from your school. Even if they don't have great teachers, they'll give you a structured form to learn CS principles. If your school doesn't offer CS courses or you want to supplement your learning, I'd highly recommend you take Coursiva/EdX courses for the topics you would like to learn. This, of course, takes patience and discipline, but you'll end up being very prepared to study computer science at university. Source: I'm a 17 year old CS student