Dedicate your life to a cause that inspires you and also greatly serves others. Master plan your life. If you don't fill your day with high priorities, it will automatically become filled with low priorities.
I learned early on that one of the secrets to campus leadership was the simplest thing of all: speak to people coming down the sidewalk before they speak to you. I did that in college. I did it when I carried my papers. I would always look ahead and speak to the person coming toward me. If I knew them, I would call them by name, but even if I didn't I would still speak to them. Before long, I probably knew more students than anybody in the university, and they recognized me and considered me their friend.