The most dishonest thing I have ever done

As I can remember, I was a crafty and vicious kid when I was a junior high school student. I enjoyed cheating someone I didn't know and getting little profit from them. Although I was not a honest guy in that time, no one detected my true selfhood.
I was an outstanding model lives on their perspective. I was very active in my class, I was not only a leader, but also a man who charged with order. Therefore, my schoolfellow gave me the most respect. Beyond question, they were not concious of my real personality.
One day, I rambled along the river embankment. All of a sudden, I saw an emaciated kid riding his bike straightly in front of me. It so happened that I had gotten frustration, so I decided to play tricks on him. I imagine three steps: first, I threw some small stones to the boy's bike. Then, he would stop riding and check his bike. Second, at the same time, I ran into him rapidly and hit accompanied kick him. Third, snatched his bike and ran away. I didn't tell anyone I got such a shame behavior and I felt greatly guilty about the un fortunate kid.
As I grew up, I am not the treacherous guy I have ever been. Now, I'm a relatively honest freshman of NCCU.