there's definitely a non-zero number of people who self-diagnose as something to feel "special," but for every one of them there are five people who are autistic or ADHD and need accomidations but won't get them because the people around them think they're doing them a favor by insisting they're not "broken." you don't want your kid to be the first thing, sure, but also make sure you aren't causing the second thing- if you're in doubt, the right person to ask is a psychologist or a psychiatrist. however, that can be very expensive, hence the whole self diagnosis to begin with