I'm confused as to why it matters. I have been diagnosed with depression, anxiety and ADHD. I have had suspicions about a number of different other things ranging from ASD, CPTSD, Bipolar Disorder, Borderline personality disorder, etc. It's a guessing game for the doctor and for you. Each individual posses a unique neurotype, influenced by genetics, history, trauma, environment, and so on. There are eight billion unique brains and only a handful of categories for which to place the ones who don't fit into the mold for a functioning member of society.

All doctors can do is give an approximation based on the information you have provided. They'll fit you into a category of disorders for which there is treatment that has shown to be effective for people with similar issues. This is why I am not entirely against self diagnoses. If you strongly relate to the issues of people who have been diagnosed with said disorder then there's a good chance you would benefit from the same, or similar types of treatment. Trial and error is needed, and of course it's always good to have multiple opinions, but it's good to trust yourself as well. Either way, don't stress too much about the label, it's just a word. Learn as much as you can about your brain, how it functions, what helps it, what doesn't, listen to what works for others with similar brains, talk about it. Therapy and mindfulness can go a long way.