Having mild Autism and being HFA or Aspergers, appear normal but face difficulty in education, employment and social interaction.
There is not as much support for a person with a mild form of Autism compared to people with more severe Autism.
Severe Autistic people are likely to be non-verbal, have low IQ and mobility issues.
It is a real problem that people with "mild" or "high-functioning" autism lack support because it's often assumed that because they can, with great difficulty, pretend to be neurotypical, they don't need it. I can attest firsthand that is incredibly stressful and exhausting having to "fake it" in everyday life to get by.
Thankfully, I myself at least am now very well supported, in large part because I work for a primarily Autistic organization where my boss and manager understand my needs because they're also on the spectrum.