You raise good points, as usual. I suspect that the moments when you are acutely and suddenly transported away from the scene you had been interested in, the act of being transported away, are the glitch that makes up ADD. The affective response to the act of being taken away from the source of interest-excitement would then be shame affect (primary shame) as the experience of impediment to continued interest. The realization that you are not in synchrony with your peers, and your associations to this lack of fit, would represent secondary shame.
I sure hope you remain more puppy dog than shrew. I'd rather live with the constant hope for novelty than the constant bitterness that disavows the possibility of love.