It's like one of the pages with autism spectrum testing tools says: "If you take all of the tests on this page, you're probably on the autism spectrum." - most people won't diligently spend 3 or 4 hours trying to see if they're autistic, to a degree that is somewhat diagnostic.
The best tests available are things like https://psychology-tools.com/test/autism-spectrum-quotient - for reference, I'm diagnosed, and before I took it, I got a mid-level score, because I didn't understand the comparative degree to which those things were true for me, e.g. "I often notice small sounds when others do not" - how do you know if you aren't aware and ask?
So, it's a bit like the old saw about "If you have to ask, you'll never know" - it's worth seeing a mental health professional and asking them, because they can provide you the feedback that people on the spectrum are critically missing out on.