We are, each of us, a product of the stories we tell ourselves.
Regardless of how hard we try, we are all biased. We all have a background and focus on different aspects of each experience we have. In this way, we experience every emotion, every event, every encounter through our own lens and it is impossible for us to be completely objective.
The objective event or experience we had doesn’t matter. What matters is the details in how we feel about the event as we experience it and the stories we tell ourselves about it afterwards.
This does not mean that tragic events don't matter, only that the most important part of any experience is how we respond to it. In this same way, trauma is different for every person.

