Many people don't want to learn.
Some I've met though just think classes such as biology and chemistry are useless.
EDIT: Wait, wait.
>I don't know if I'm intelligent
You would know if you were intelligent, wouldn't you?
EDIT: Also no... Intelligence is relative, I believe, if you compared me to a genius I probably wouldn't seem intelligent. Compared to a young child maybe I would. It would also depend on what you consider intelligence, a bunch random knowledge, or a complete understanding of one thing?
(Also typing can sometimes lead to a state of pseudo-intelligence, so I apologize if I give off that kind of vibe.)