See the glass half empty - Idioms by The Free Dictionary
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see the glass as half empty
To view a situation as generally worse or less hopeful than might otherwise be perceived; to be pessimistic. When it comes to the state of the world, most people see the glass as half empty. But they forget all the progress that has been made.
(see the) ˌglass half ˈfull/half ˈempty used to describe whether somebody has a positive or negative attitude towards something: People are prepared to see the glass half full at the moment rather than half empty. ♢ He’s a glass-half-full type of guy (= he always expects good things to happen).