This can be one of the symptoms of PTSD, I have struggled with this myself. It's from how a trauma or even several traumas interrupted your life so now you are very sensitive.

I struggle a lot because of how my husband who has both ADHD and Dyslexia is one that constantly interrupts me and talks over me which is something some individuals with ADHD do. Sorry, it sounds like your normal has a lot of hypervigilance in it.