So I have this bad habit right?

I memorise license plates. And I do it seriously. Like every time I am outside of home I have to memorise at least one plate otherwise I feel frustrated. If I screw up memorising the plate I also get really frustrated and rack my brain trying to remember it perfectly. Like I can spend 30 minutes trying to remember a plate I saw a couple days ago. It used to be a lot worse around 30-50+ plates a day but now it’s more around 10 plates a day and I have more days I only memorise 5 plates. I started it randomly out of the blue and have been do it for over a year now. When I try to quit it I always end up doing it again. Could it like mean anything? Is this normal or is it just me?