For your ancestors in ancient history it would have been important to be able to be in the moment, but it also would have been useful to be able to leave the present moment and remember past experience to draw on learning and to be able to plan a journey ahead. Being able to simulate not just good outcomes but also what could go wrong was a big advantage as they could change their plans or be prepared. It seems though that over many generations of practice that we have gotten so good at this type of mental simulation that we now have the phenomenon of worrying: believing the idea to be more real than the reality.
Action: Worrying means well; it’s a protective mechanism, but it is important that thoughts or feelings about something are considered secondary to what is happening in the present moment. Take simple opportunities to reconnect with the here and now, reminding yourself that what matters most is what exists in the present reality, and if worrying occurs appreciate it as the helpful tool that assisted our ancestors but something that can be used more minimally and occasionally in your life today.