My diagnosis don't bother me, and I don't think they mean much. Neither does my therapist. In my mind psych diagnosis are not the same as a medical diagnosis, like AIDS for example. If you have AIDS you have AIDS, but if you have say "panic disorder" like one of the things I supposedly have then that just means you had enough of those symptoms that day.
Let's say I had a year where a close friend died, I lost my job, and was dumped by my fiancé. A month later someone breaks into my apartment and vandalizes it after stealing whatever I have of value, and I respond by walking into this scene and having a panic attack. And this panic leads to a chain reaction of worry and panic and depression...
No I don't think anyone is their diagnosis. At least I'm not. I have "major depression" and major baggage, but I maybe wouldn't have this had my parents not been so majorly f***d up and cruel. I look around and see a world of people that are nuts. I'm sure some of them think I'm nuts. It's all good.