> interfere with your daily life
If it's all you've ever known, it just is your daily life. How would you know any different?
That's where you get an impartial third party involved.
They can tell if you are indeed outside the standard deviation for the population, and help you identify if and how to get back up to par.
It is autism regardless of it interferes with your daily life. The decision if you want to treat it or not (should) depend on if it interferes with your daily life.
Not necessarily. If you ask 100 people if they have ever encountered these issues, all 100 will say yes. It's those whose lives are negatively impacted by these issues outside the norm who get the diagnosis and need outside help.
That said, not all psychiatrists are created equal, and some of them suffer from the same biases as the rest of us. Try talking to an autism specialist.