Cameron Bielski led Dover-Sherborn High School to the 2010 Division 3 Massachusetts State Championship as a senior. He was a four-year starter and captained the Raiders during his junior and senior seasons, tallying 17 goals and 22 assists as a senior. Over his career, Bielski scored 49 goals and added 49 assists. He was a two-time Tri Valley League MVP and was named to the All-Eastern Mass and All-State Team during both his junior and senior seasons. Additionally, as a senior Bielski was an All-New England selection, was named to the All-Scholastic teams by both the Boston Globe and Boston Herald, and was the Metrowest Daily News Player of the Year. Bielski also played club soccer in the U.S. Soccer Development Academy for the New England Revolution. Prior to joining the Development Academy he played with the Massachusetts Olympic Development Program, serving as the team's captain.