How had Baba contribute to Amir's state of mind?

Baba has been far from a perfect father in The
Kite Runner. In his own mind, his plans for his son, Amir, have not panned
out. He wishes Amir to be big, strong and physically imposing--like Baba. However, Amir
turns out to be an introspective boy intent upon becoming a writer. Baba is not
impressed with Amir's writing skills, nor does he pay much attention when Amir wins the
kite-flying tournament. Amir comes to realize that there is little he can do to impress
his father.

When Amir believes that Hassan is receiving too
much attention from Baba, he plants evidence to make Hassan appear guilty of theft. Ali,
Hassan's father and Amir's lifelong friend/servant, packs up and leaves with Hassan.
Amir's plan backfires, however; he loses his closest companion, feels guilt for the rest
of his life, and becomes even more distant from his father. After their move to
California, the father and son relationship improves dramatically until Amir discovers
the secret that Baba has been hiding from him: Hassan is actually Baba's son--not
Ali's--and the two boys are actually half-brothers. This further complicates Amir's
emotional state and state of mind, and he determines that the only way for him to seek
redemption and improve his state of mind that is so unsettled by Baba is to return to
Afghanistan and retrieve Hassan's son--Amir's nephew--from the hands of the
Taliban.