Anybody who can do the stuff you can do, well... that says a lot right there. Besides... to me smart means natty as in a dresser... intelligence, now that is something else. There is book smarts, and real world smarts, book learnin and life's learnin...... all are good in their own right, but the first without the second is only half smart
My Father-in-law God Bless him, is one of the smartest, most inventive able persons that I have ever met. Due to growing up in hard scrabble times, in the depression, and being one of the strongest in the family, he got to go to school for all of 3 months or so. Can't read a word, but boy, can he figger.... the stuff he can do is amazing.
He is an icon of real world smarts... we need people like him to make sure the world is a balanced place.
And, don't denigrate yourself... you are a pretty sharp dude.. and don't you ferget it young fella