To make life into a story is to project onto it meaning. If you don't view life as narrative, what do your actions matter? The "happy endings, fairness, justice, heroes, villains, turnabouts, karma" JoshTriplett lists are the narrative projections which make life feel valuable in spite of life's trending towards wavering extremes of boredom and suffering. The OP's argument coincides with the Buddhist and Taoist posit…
Young children don't need 'meaning' to enough life, which IMO is a philosophy as valid as any other. I used to have quite a bit of existential angst and personally I found the most useful thing to do was finding something interesting and do/learn it. It's easy to get into a rut where month after month you follow the same patterns. Especially when living in doors most of the time removes most seasonal variations.
All of them are fundamentally narratives about power. Children incessantly dream of having more strength than they currently do. Why that is the case should be profoundly obvious.
It may not seem like meaning to us because of its naive purview, but to children their own narratives about their power are all-encompassing epics detailing a hoped-for relation to the world.
And why should the season matter? Outside of its aesthetic attributes, attributes we project upon it, it is merely a small change in temperature as the angle of the sun's rays move in relation to the crust of the Earth, followed by some shifts in the flora and fauna populations -- beings which are themselves merely carbon-based machines arising from the repetition of simple chemical processes over very large time scales.
Those things that we find interesting are so because of what we project upon them, not as a result of what they fundamentally, physically, objectively are. The very idea that something should be "interesting" implies a subjective witness to project their own feelings onto the meaningless physical trivia of the universe.
If your goal is to live a life without lies, you'll be living a life without meaning. There is no meaning outside of the beautiful, nay, holy fictions we tell ourselves.
The beauty in childhood isn't that it's all truth, it's that its all lies. They don't yet have a concept of truth and lies, and so are free to live entirely within their dreams. We, on the other hand, are in some ways shackled to reality by our experiences of materiality.