No one should make you feel bad just because you come from a different country, city, or town. Maybe you are a little different from other children because you have a different language or a different way of speaking, or because you have different likes, customs, and ideas. But being different is not a problem. We all have to learn to understand and respect what is different from what we are or have. Each child is different and each child learns in a different way.
Some children learn more slowly than others.
Some are good at some school subjects while others are good at others. If you don't learn fast, maybe there is nothing wrong with you, but with those who teach you and with how they teach you. No one can learn if they do not understand what is being taught, or if they don't find it interesting or useful, or if they are constantly threatened and punished. Don't allow anyone to call you dumb, ignorant, or stupid. If you don't understand something, ask.