Howdy. I'm someone who's been diagnosed with Generalized Anxiety Disorder. I have panic attacks somewhat regularly, I take medication, I've done therapy in the past, etc.
Just to clear up what I perceive as a misconception - it almost sounds like you're suggesting people prone to anxiety have neglected to reflect on that, like they're just being lazy about it out something.
Buddy, I know I have anxiety. I know about the traumatic experiences I had in the past, and my family history, that contribute to my condition. I've reflected on it plenty.
"Working through it" doesn't do what you think it does. It's not a cure. What you learn to do is understand the patterns of thought you get into, to recognize when you're falling into an unhealthy pattern, and tools that you can deploy to manage that situation.
It's more like managing hazardous waste than flicking a light switch. I wish it were otherwise!