I get racing thoughts more than brain chatter, these racing thoughts can be really disturbing at times and can really hinder my ability to concentrate or leads me to "space out" (as described by my friends) so i don't blurt out something inappropriate (even though at times i used to). I used to feel guily about thinking the way i did and thought i needed to somehow control the constant thoughts in my head like Peculiargroove said learning to let bad thoughts slide instead of focusing solely on them is difficult but can be done over time. I'll still occasionally react to some thoughts in my head by little tells such but that's still a vast improvement from my previous behaviour. Just so you know you're not alone.