OP you are Half right and half wrong.
You are correct for pointing out a lot of people just make "depression" their entire identity and use it to relate to others whilst not possibly being "truly depressed".
You err by assuming you know what depression is in a clinical context where it does rob the potential for joy from people and sometimes what helps these people cope is talking to others about how shit everything is.
Depression can limit your functioning.
Depression is more than just being down because some bullshit happened it can even be without cause itself and there is NOTHING you can do about it because that implies it is a response to a lack of something you want or need.>>248532>There is no such thing as depression as a mental illness. What we think of depression is just our natural response to bad external stimuli
Agree if you mean existence itself being incompatible for someone.
If your depression is caused by something you are a lucky bastard and just need to try go get whatever that is. Even working towards it will make you feel better.