The first time I went to the psychiatrist to ask to be tested for this was three years ago. They told me I can't have it, because if I did I wouldn't be able to maintain a job, and being able to do good at work, especially as a dev, should be impossible. They said I'm depressive and put me on SSRIs that fucked me up for 6 months.
I was depressive, been like this ever since I was able to reason for myself and figured out that neither me nor others know what the f* this whole thing I'm waking up is, but my depression is my always-there companion, that keeps me humble and thoughtful of life. What the SSRIs did to me was very different, and much, much worse.
Adult testing is a thing, and I'm not mad at all for not getting a diagnosis earlier, I'm just grateful that it happened at all.