Autism is not an emotional problem. Autism is a neurological condition which people are usually born with. Psychological trauma doesn't cause it. More common in boys than girls. Autism is not a psychosis or lack of reality contact.
Symptoms can range from mild to severe.
People do not choose to be autistic. Interferes with speech, learning, and social skill developement. Autistic people have some disadvantages, but some live very happy and rewarding lives.