OP, freaking out about something you know is ridiculous/super unlikely/you've already been doing for years is like THE textbook sign of an anxiety disorder. Not trying to make a huge deal out of it, but you might start noticing it creeping it into other aspects of your life, maybe consider going to talk to someone or at least start practicing some mindfulness techniques.
(For example, a few years ago I used to get suuuper freaked out riding in cars with people for no good reason but I was obsessed thinking they'd crash/go off the road and it got to the point where I was declining road-trips with my friends, just cause my anxiety was so bad.) Mindfulness really helped me break the cycle of these thoughts, and while I sometimes get those shitty thoughts, its much easier to just let them pass and enjoy the moment.
Sorry to get on a pedestal/talk about my own shit here, but this sounds just like something I'd struggle with too!