It may seem a bit naive: "(of a person or action) showing a lack of experience, wisdom, or judgement"
But maybe that "lack" can be useful. Let's say the "glass is half full, not half empty."
As they say, "Perception is unique to every individual and is simply one's interpretation of reality."
Being optimistic seems sort of radical and out of step these days.
And those "interpretations" can get us into trouble. You hope to see the world with clear eyes. You want to listen to reality at all times. Still... I say... lean forward, and to the light.