I know what you mean! my mind is really slow when i'm talking (time gets too fast >.<)
I also mess with words, have frequent awkward silences, sometimes stutter, tell secrets (without noticing, just trying to be nice), sometimes i tell offensive jokes (also without noticing)... This kills me, because even my friends dont pay attention on me, i would like to be a least "nice", not COOL, just nice. ;///
I already tryed Yoga to get more concentration, memorizing songs and singing (to speak better), listening what other people say (to learn), playng chess (to get smarter)... but wtf i still retarded