How come when someone talks to me I reply back fast and loud and frantically

[Vermilioncore]

For example at my old job this slut snuck up and said something to me in a normal voice and I replied quickly and loud as if I was on a stage reciting a speech. I also fumbled my words. Right after this I went dead quiet again as if I’m some animatronic that got activated five nights at freddys type shitinnit