Apologies if this covers something already said.
I'm quite close to an emotional overload so I am finding it difficult to concentrate and take information in.
A test on the internet, regardless of what test it might be (AS-Baron-cohan, RAADS-R, etc etc) cannot tell you for certain whether or not your autistic.
For that you will need to see a specialist. More is involved than just those quizzes.
Why does it both you when people state your autistic?
If you've stated to them, you are not and they persist, have you discovered their reasons?
Just because you are shy, quite and somewhat intelligent isn't enough to classify someone as autistic.
That just means you're a quite,shy person that is somewhat intelligent.
In terms of imagination, stating that an autistic individual isn't imaginative is ridiculous.
Every autistic person I've come across has had quite a vivid imagination.
What they lack is imaginative play.
I.e; This barbie is mother, this ken doll is father, lets play happy families.
An autistic individual more likely to pull apart the dolls to see what is inside of them, rather than play "families" with them. They are aware dolls are dolls. (this is in children)