Miller has been playing football since he was 3 feet tall on the SCRA (South Cherokee Recreation Association) Redskins. His high school coach was Mike O'Brien. As linebacker and tight end, Bruce led Woodstock High School to its second ever playoff appearance. He played college football at UCF, redshirting his first year and winning All-Conference honors for four years. He was named CUSA Defensive Player of the Year his junior and senior seasons. He was drafted by the 49ers in the seventh round of the 2011 NFL Draft.