Anxiety is like anger, everyone experiences anger and statistics say the average person gets angry 6+ times a day, but for some people that's killing them, and for others is manageable. Having anxiety, like when you're playing a video game, isn't the problem, it's managing it, and reducing it, if you have a panic disorder, you're getting high leaves of anxiety in situations you shouldn't be having any anxiety.
I have to say, it is indiscriminate, and part of the issue with generalised anxiety is the perception that it relates to specific stresses rather than your body's uncontrolled response to them.