Firstly, the Word 'normal' only expresses the fact that if a person does not ac liket most people in society then something has to be wrong with them which in some cases is simply not true. Some people enjoy being different, but it doesn't mean they are abnormal. Yes, some people can have mental health problems that may not surface until they are in adulthood or, sometimes during childhood and the individual can act perfectly normal in many respects with few symptoms that people may not notice in the personand are often labeled 'peculiar.'
