You get fluent in whatever you rehearse. Rehearse complaining and you’ll get very good at it.

Talking is practice. Whatever you say most often becomes the easiest thing to say, until a habit of grievance arrives faster than any other reaction and starts to feel like clear sight rather than a groove. Fluency is neutral, and it builds around whatever you keep repeating.

Listen to yourself on the walk home and notice what your default sentence is. Try trading one complaint a day for one plain observation about what went right. This is not about pretending things are fine; it is about not getting expert at a single note.