Having just had an unofficial diagnosis, I have got a number of "but you don't act like ...", "I would not have picked you for having aspergers", "but you seem to cope really well..." - even from people who are very familiar with autism and related conditions.
I also had a psychologist state outright that I did not have Aspergers after a very brief conversation - without asking about any of my previous history. At that stage I had not read anything about females with aspergers and had only suspected I had traits. Looking back now I can see how it has affected me throughout my school life (especially high school), my jobs (all ended with meltdowns - largely stress induced)
I was diagnosed with depression in my teens. The one problem with that is, when you have that sort of diagnosis, it is the automatic response when you present with vague symptoms. My aspergers wasn't diagnosed until this year, my sleep apnoea was not diagnosed until after I fell asleep/blacked out while driving forcing a diagnostic test. The symptoms for depression are rather vague and can not be diagnosed with a test, but tests for other conditions are not always considered by most doctors.