Don't wait until next year. Start programming now. School is good to learn computer science; school is not needed to learn how to program.
Don't read anything into the 5 lines of code per day. This is a pretty old article and even then, that would only be a reasonable figure if you take a large number of people on a large project and compute an average for everyone. In other words, counting refactoring, fixing bugs, re-writing things, doing administrative work, and so on towards the time elapsed. And even then it would vary so much from one project to the next that you couldn't get a reasonable representative number, though 5 LOC per day would certainly be possible.