lol, theres nothing to understand other than his family got killed by his older brother which should have resulted in serious trauma and then living on his own since he was a child which would have been very hard. someting i forgot oh yea being surpassed by naruto a.k.a loser ninja. well it would be pretty hard to live with but a person with a strong mind would live through it. okay he has been through alot but its not enough reason to act like a jackass all the time, take your own life, yes but not act like a jackass.