I guess it all comes down to what YOU think you are capable of. We get that from our parents and the surrounding community. What I don't get is why anyone would put limits on a little kid?
My brother was never a good student, and my parents worried about him. But they always encouraged him in his strengths. My mom and dad always acted as though I could do anything in the world. I try to do that for my kids, and as a soon to be teacher, it's a high priority for me.
I guess some people don't realize how they limit their children. It's pretty sad. Teachers have a lot of power, more than they realize, to affect the future of students. It's just like parental power.