I grew up somehow thinking I was stupid. I'm sure it was how my father treated me. I was in my final year of college and suddenly realized that stupid people don't have a 4.0 gpa. Take the ob<x>jective evidence and embrace it.
Why not simply pick on and get on with the work?
Here is the secret about universities and colleges. Unless you really need the brand name to get an in into a certain field, it doesn't really matter in the long run.
Unless you're going into politics you don't really need Yale or Harvard,and one is as good as another. And 5 of them accepting you sure doesn't sound inept.
Either depression, or someone really programmed you that you couldn't do anything.<br />
...If the latter, don't ask why, ask how it controlled you.
This is part of the human condition, everyone feels like this... well most 'normal' people