1. I honestly don't know.
Yamatai is the most prosperous and wealthy among the human factions. Its citizens lead comfortable, often luxurious lives, which often frees them to pursue more artistic or esoteric careers.
However, this seems to indicate that they were wealthy.
2. Sure, I guess... I didn't find anything about a Star Army mind-wipe policy yet.
3. Boring. Sam had food, clothing, and shelter. That's pretty much it.
4. Sam took their death's pretty well actually. It wasn't much of a change after all. His parents didn't really play much of a role in his life while they were alive anyway. As an accidental birth, he was an unwanted child. He was never held or given affection of any kind.
5. Their deaths neither broke him nor freed him. They rarely spent any time with him or told him what to do. As such, he was usually alone.
6. No, Sam didn't resent them for dying. However, he did resent his mother for giving birth to him. What purpose was there to make a child one did not even want?
7. Sam pretty much took care of himself until the Yamataian government intervened and put him into the Star Army Academy.
8. I assume anything run by the Yamataian government would probably be rich.
9. Life was pretty much the same. Sam still never received any love or affection. However, being in a military academy, he probably had most of his freedoms stripped away and was constantly ordered about.
10. Sam's adolescent life was nonstop military drills and training.
11. Sam wasn't a bully. However, I wouldn't exactly describe Sam as a good boy. He just sat in his desk and kept to himself, never bothering to interact with anyone unless ordered to.
12. Considering that most Sam's free time was used for studying or training, I can only assume he got good grades. He wasn't retarded or anything.
13. Sam had no friends.
14. Sam had no one he considered enemies. However, it is possible some students were jealous of his good grades and hated him.
15. Well, Sam recently graduated from a military academy, so it seemed like the logical thing to do.