why bother 何苦；何必麻烦；何必；为何那么麻烦

【例句】
Why bother your head about such trifles?
你何苦在这些小事上伤脑筋？

Nothing I do makes any difference anyway, so why bother?
既然我做什么都于事无补，我为什么还要费劲呢？