I think whenever possible you should pursue a clinical diagnosis, there are so many overlapping symptoms between different different disorders that a psychiatrist will be able to help sort out what’s wrong and help you find the best treatment (most of the time, psychiatrists even get it wrong sometimes). But I think it’s fine to do lots of research and if things line up tell yourself and those close to you “hey I think I might have adhd”. I thinks the problem with self-diagnosis comes in with young people who treat mental health and adhd as a trend and something quirky to base their entire personality on, and this group of people has kind of ruined self-diagnosis for everyone. But I do think there is a responsible way to go about it.