Hi, autism is a very broad spectrum and there are also those with very high functioning and those with low functioning. Therefore, even if your friend knows a certain autistic person it does not mean that they are all exactly the same. If this is how you feel, maybe you should get a professional diagnosis.

No two people on the autism spectrum are alike, in my opinion. There are soooo many factors that are affected by autism. Certain factors may be severely affected in one person, but hardly show up in another. But proceed with caution with online tests and self-diagnosis. See if you can get in to see a psychiatrist or a clinical psychologist for more information.