I am a sixth grade boy. I usually like to wear a bellyband. Is it okay?

You can, but I think if you let the children know, they will laugh at you. After all, wearing a bellyband is for children. Once you reach your teenage years, you no longer need to wear them. Although it is just a personal habit, children will laugh at you for being naive. I think you should take off your bellyband and slowly get used to it so you don’t need to wear it anymore. It's better to dress the same as other boys. You won’t feel burdened by wearing a bellyband, and you won’t have to worry about such things. Whatever you wear is a matter of habit, just get used to it.