Since you asked for book recommendations, Playing Smart by Susan K. Perry includes lots of ways to make learning fun. Kids are mean to me. They call me stupid and make fun of the way I talk. It makes me really mad. Sometimes I get so mad I feel like I'm going to cry.
Many schools have counselors who are trained to help kids who feel sad or frustrated.
Other counselors may work in offices near where you live. Tell your parents that you would like to talk to a counselor. Your teacher or principal may be able to give you the names of counselors. Or your family doctor can help you find a counselor. Even if you are not sure what to say, counselors can often help you talk.