"Living in the moment" is a characteristic of infants and most animal species like dogs and cats. In psychology class I was taught that the ability to contemplate the self, the past, the present, and the future, was one of the things that distinguished humans from animals.Lodge2004 wrote:
If anything, my willingness to be vulnerable makes me stronger. My newfound ability to live in the moment, rather than in perpetual, agitated anticipation — and dread at maybe having to put a bullet into someone — gives me more joy.
When this happens to an adult human, it is sometimes called "regression".