Don't even think about IQ, dude. When I was in my mid-teens (14-15 y/o), I used to think the same. "My IQ is high, because of that my mouth can't sync with my mind" lol. I cringe when I think about that. I came to know that intelligence is not a thing to be proud of, and I was really finding excuses for my stutter. (Stutter wasn't my fault, it's something I got somehow). BTW, I sucked at university, couldn't even focus. (18 y/o), then I found out my "IQ theory" was false. (I'm 23 now).