How to learn how to code?

Hi, I'm a high school programmer in my high school. I have limited knowledge of HTML, CSS, very limited Javascript,decent NQC, and KissC. I know very limited python.(These are all from classes or my robotics club.)

 I want to major in Comp Sci, however I feel a lot of people go into comp sci with a lot of experience with computers. I'm computer literate, but not brilliant. Any good suggestions for books/websites to teach you how to code? I'm not sure which languages would be the most useful.  Any good suggestions for websites to teach you the advanced basics with your computer.(I mean I know how to use MS word, and use all the basic stuff on it, but not the other stuff. Like I couldn't dual boot linux if I tried. I've asked friends for advice, but they've basically said that they're too lazy.)

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CS may not be about computers, and it may not be a science. But learning to program is all about spending long hours actually writing code and running it on a computer. You can't learn how to program well if all you do is read books and don't apply your knowledge.