Nope!
Definitely not stupid!
You've got a big, kind

and offer way too much sound encouragement and advice to be stupid!
I didn't do well at math and science at a younger age, and felt something was right wrong with me somehow.
Now I'm in my 50's and some of the stuff I had such a hard time grasping way back then is more easy to grasp now.
I, too, thought I was stupid, but now I think that perhaps that part of my brain wasn't quite developed enough yet to process those things ...
Or maybe the brain's too busy helping us survive whatever fresh hell's we were and are growing up in?
At any rate, and again ... You's not stupid and you's most valuable and important to this community ...
Please don't ever forget that!
Sincerely,
Pflower!