Confidence is the opposite of Fear. Fear is related to Worried. Worried is a synonym of Anxious. Anxious is a synonym of Concerned. 
Bother is a synonym of Eat. Eat is a synonym of Disturb. Disturbing is a form of Disturb. 
Confidence <--Antonym--> Fear <--RelatedTo--> Worried <--Synonym--> Anxious <--Synonym--> Concerned 
Bother <--Synonym--> Eat <--Synonym--> Disturb <--FormOf-- Disturbing 