Answer:
Lonely and alone.
Explanation:
Though Ebenezer attented a boarding school and belonged to a pretty good family back then, he was always lonely and alone at school.
Stave 2 depicts how Ebenezer would sit all alone near the fireplace while reading books. When the Christmas spirit showed Ebenezer this scene from the past, he wept to see himself as a poor forgotten self.
Ebenezer then regretted not giving anything to the boy who was singing a Christmas Carol at his door last night. The scene from his past reminded him that the boy who sang the Christmas carol was just like him.