I believe very strongly that what we think, what we know (or think we know}, what we believe all conditions the way that we perceive the world and interact with it.

So, if you have a sunny, optimistic and positive outlook, you will get similar feedback. There may be an element of confirmation bias here.

If you have become very jaded and cynical, you will see lots of confirmation for that.

The positive outlook has to be the better way to go. See this quote from Google…

“All looks yellow to the jaundiced eye” is a famous proverb popularized by Alexander Pope in his 1711 poem, 

An Essay on Criticism (“All seems infected that th’ infected spy, / As all looks yellow to the jaundic’d Eye”). It means that prejudiced, jealous, or cynical people perceive everything through the lens of their own bias, distorting reality to match their negative perspective.