A deeply personal diary shown to a Brisbane jury has revealed a private school student accused of planning a terrorist attack repeatedly acknowledged he “needed help” while documenting mental health struggles, violent thoughts and an obsession with explosives.The now 16-year-old boy, who cannot be identified due to his age, is standing trial in the Brisbane Supreme Court charged with committing acts in preparation for, or planning, a terrorist act.He has pleaded not guilty.On the third day of the trial in the Brisbane Supreme Court, jurors were led through a series of intimate journal entries penned by the teenager.The prosecution alleges...