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Take a look at tier lists created by pros like: http://leagueoflegendstierlist.blogspot.com/p/solo-queue-tier-list.html or Elementz' tier list. Just play high ranked AD carries on their tier lists (ask around and find out which ones are easiest to play).
You ought to watch some streams too. Just watch one or two games of a pro playing AD carry so that you know you're playing them correctly. (I know that you think you play it correctly already -- but you probably don't if you're stuck).