Thinking to much?

All the time and forever I always talk gibberish to myself (in my head). And usually insult people in my head (if they are mean). I understand the gibberish easily in my head! But, at times.. When I really don't want to say out loud..I do! It just comes out,out of nowhere! Almost like me thinking of this weirdo that likes pink. I whisper in the most twisted face ever, *oh god, ugh. That's just not weird at ALL* People just look at me like a cow just drank its own milk from the source!
Is this normal? *excuse my English*