Funny, I had the exact opposite reaction. Things I had taken for granted all my life suddenly became un-anchored and as a result so did I. I have never felt an actual feeling of panic that threatened to overwhelm me before that happened and it was a very mild earthquake. I had to really force myself to calm down and stay rational and do what was the safest rather than to give in to the 'flee' reflex.
The problem with earthquakes is when they start you know you're in one but you have no idea where you're headed, whether this is as bad as it gets or whether you're going to end up in a pile of collapsed rubble and what is the best decision greatly hinges on something you can't know ahead of time, which is the peak magnitude and the kind of earthquake you are experiencing.
99% of your problem can be solved by studying statistics for your area, and having a plan... So that you aren't just at the whims of the moment when it's actually happening.
I always was in one of the major cities so I had full confidence in them. Lacking the natural fear of death probably has something to do with it as well.
> Things I had taken for granted all my life suddenly became un-anchored and as a result so did I.
Same for me. If you don’t grow up with a number of small regular quakes or live in high-rise building that sways with the wind, it’s pretty unsettling to feel, what you always know as stable hard ground, solid buildings all of the sudden bouncing around. Rationally you know what it is and how it works but it’s still scary.