I believe in trying to have a good attitude: that living a satisfying life is (largely) determined by our mental habits and the ways we choose to approach the world. Yet at the same time, I think our culture of positivity is leading us to forget the value of our other emotions. It's causing us to frame anything less than happiness as a personal failing, rather than a natural part of life.
But what we so often frame as "negative" emotions - things like anxiety, doubt, loneliness - are in fact assets to us. They cause us to pause and examine our lives and our choices more carefully, serving as indicators to where we need to direct our attention – sometimes to recesses we might otherwise ignore.
If we bury the feelings that challenge us, masking them with smiles and platitudes, we may rob ourselves of something more valuable than ever-fleeting happiness: personal and emotional growth. And ironically it is this kind of growth that makes happiness possible.
I am all for trying to turn lemons into lemonade, but only insofar as it does not limit us or deprive us of deeper experiences. Because rarely is happiness something one can truly strive for; rather it is byproduct of engaging fully with the world, recognizing the multitudes of being and the value each element brings.