Bendinskas was born to a peasant family in Skersabalis village, Marijampolė district, Lithuania on 23 February 1920.
[1] Bendinskas enrolled in the Technical Faculty at the Vytautas Magnus University in Kaunas in 1938, graduating in 1944.
[2] In 1941, Bendinskas was an active participant in June Uprising in Lithuania, directed against the occupying Soviet forces.
Upon returning to Lithuania, he joined the anti-Soviet resistance activities, helping to publish and distribute banned literature and newspapers.
Bendinskas worked as a mechanic in various factories, as a constructor in a design and construction bureau and as a craftsman at a vocational school.