Got promoted eight months in and now I'm half convinced everyone's just waiting for me to mess up

Manager pushed for it, said I was doing the work already, just needed the title to match. Should feel good. Instead I reread my own PRs looking for the thing that's going to give it away. Nobody's said anything remotely close to that, this is entirely a me problem. Curious if this fades on its own or if I need to actually do something about it.