How did Helen Keller realize she was blind and deaf?

Helen knew she was different to other people before she was seven years old when Annie Sullivan first came into her life. As she was blind and deaf, Helen was only able to communicate with her family members by way of using hand signs. Despite her obvious disabilities, Helen was a very perceptive child, and she noticed that members of her family communicated to each other using their mouths. It was fascinating for her to touch people's mouths when they were talking. At the same time though, she found it an incredibly frustrating experience, because this was a form of communication from which she was excluded by her disabilities. She tried to communicate using her own lips, but it was no use. Ultimately, this is what made Helen realize she was blind and deaf, and that she was different from other people.