Replaying Traumatic Events: Is It Normal?

Does anyone else have scenarios in their head where you go back to the traumatic events, and basically play out how it could've been different? Like adding someone there who wasn't, or saying something you were too scared to say back then, and creating, like, a sort of mental movie? I just want to know from others like me if this is normal and if I shouldn't be doing this because I should think about what happened as little as possible. 💙