A slew of studies show that optimism can help:

Control stress
Boost your mood
Manage pain
Support healthy lifestyle choices
Reduce your risk of dying early

And even if you’re a born pessimist, there may be things you can do to tap into these benefits. “Optimism is a skill that anyone can practice and improve,” says psychologist Elizabeth Lombardo, PhD"
And don't forget to do exercise, meditate and drink some happiness teas too! :)