OP, how old are you? If you live in the U.S., you do NOT have to have your parents involved----unless, of course, they're paying for your assessment.
As for delays, the only one I remember having, was not walking until lonnnng after age 2----but, we were poor (I'm one of 10 kids), and I didn't have shoes; as soon as I got shoes, I learned how to walk. Then, because I wasn't allowed to wear them, everyday, else they would wear-out, too quickly, I walked-around barefoot----on tiptoe. I reached / exceeded all other milestones, in a timely manner.
I agree with the others, who say "Don't worry", that they're just trying to rule-out other "disorders", or whatever.
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White female; age 59; diagnosed Aspie.
I use caps for emphasis----I'm NOT angry or shouting. I use caps like others use italics, underline, or bold.
"What we know is a drop; what we don't know, is an ocean." (Sir Isaac Newton)