Learn when and how to use different data structures and their algorithms in your own code. This is harder as a student, as the problem assignments you'll work through just won't impart this knowledge. That's fine.
Sentiment: NEGATIVE
Advise for anybody - enjoy what you are doing, enjoy the process of learning and don't be impatient.
I've been programming computers since elementary school, where they taught us, and I stuck with computer science through high school and college.