A lot more people are Autistic than most people think. Look up the diagnostic criteria (ASAN's is easier to read and apply to oneself), if that sounds like you get connected with the community and see if you relate to things other people are saying. As an adult, it's really had to get a doctor to take you seriously, but honestly, the only thing you get out of diagnosis is hard proof in a legal, medical, or very intense social situation (as seen in phrases like 'oh yeah? prove it!'). If you don't relate at all to any Autistic experiences, you might not be Autistic. Simple as that.