A native of Redford, Michigan, Sellin played Tier 1 and 2 youth hockey before playing two years for his local high school team as a junior and senior. From 2000-2004 he played junior hockey in various leagues in both Canada and the US, including the OPJHL and the NAHL. Following his hockey career, David moved out west living in Southern California and Oregon before moving back to his home state in 2017. He is now an assistant coach with the Hartland High School Boys Varsity hockey team and resides in Hartland, Michigan with his wife Asia.