In many societies, particularly in western Europe, it not as easy to make friends as in the United States. For example, the concept of a "friend" is quite distinct from the concept of an "acquaintance." It takes months to make a "friend," but once a friendship is formed, it will last a lifetime.
If you are living with a family, your relationship will typically start off as that between boarder and landlord/landlady. It will be up to both of you to create something more than the initial, formal relationship. It may take time to adjust to the customs and habits of the family and to develop a warm relationship. Be patient: it does happen, but it takes time and flexibility.