Your teacher is probably poor, too. Everywhere in the world, most children are poor, and most poor people are children. Poverty is not your fault. If there are so many poor people, it is because there is injustice. It is our society that is wrong, not you.
All people are different.
They are of different races, speak different languages, and believe in different religions. No race is better than the other. No one should make you feel badly because you are black, Indian, or Asian. We all deserve the same respect. Boys and girls, men and women, are equal and have the same capabilities.