When I returned to the car, my phone was missing.
That is terrible. What were you doing before you lost your phone?
I was chatting with friends in the park
Have you tried retracing your steps to find your phone? It may be in a place you usually don't think about.
I will get a new one so I'm not worried.
I'm glad to hear that you are doing fine. Losing a phone can be stressful so it is good that you aren't feeling bad.