Nah, the thing is everyone has had scary experiences in youth by the laws of probability but a lot of them will not develop chronic anxiety. It doesn't really have an impact unless you had PTSD from it, otherwise your brain just processes it along with everything else.
You could have an even that triggered anxiety that you were already predisposed to, to look at it another way. I think it takes a traumatic experience in some people to bring it out of them. For me that was aged 13 when all my friends left my crummy school.
I feel like your anxiety is compelling you to find an answer still, an answer that has no quesion that you will never find. Don't give into it to ponder about it too much, you already know how it works now
It doesn't matter about the past, it's how you deal with the present, and whatever has happened, you can learn to get rid of panic attacks or live comfortably with your anxiety.