Most experts feel that is is extremely important that every child have at least one person they are friends with. Making friends can be difficult for some children, so your son may need some help learning how. A trip to the library might help! You could look for a book that is age-appropriate that teaches these skills. You also might take him to other events (maybe at church) where he has opportunities to make friends. Once he learns how to make friends in another environment, perhaps he will be able to make friends at school.