You're really smart (and so am I)
What makes a person smart?
Is it the thick corrective lenses? Is it the score they got on the ACT or SAT?
I think everyone is smart in their own way. Anyone can be smart who is determined to learn more about whatever they're interested in.
My brother-in-law who's obsessed with money management? He's money-management-smart.
My best friend who hates school but plays lead guitar in a band? He's guitar-playing-smart.
If you don't think you're smart at this point, maybe it's time to find what you're really interested in.