Lower treshold for suffering = mental illness, having delusional expectations of life = mental illness, choosing unhealthy copes = mental illness. Mental illness just means having maladaptive patterns of behaviour, emotional processing and thought, it really is straighforward. When a defective trait or a lack of adaptation to adverse circumstances can be considered large enough to qualify for mental illness doesn't really matter. This is like the argument against race that because mixed race people or nations exist race doesn't exit. It definitely exists, it doesn't matter that there are grey areas. A mentally ill person stands out as a sore thumb among those that are well. They might see dangers where there are none, they might react in a unnecesarily cold or emotional way to stimuli, they might reenact traumatic events on others like sexual abuse... It's all well known at this point.
The idea of a pathology or a mental illness, the concept, is an operational one. When it is seen as a condition that can be controlled and improved, like having one leg longer than the other or a tendency to accumulate tartar in your teeth, the approach the person takes to it is more proactive than when the personn adopts a perspective of "extraordinary suffering or extraordinary catastrophic circumstances on an otherwise healthy and normal individual".
These exist, I suffer from them today and most days, but I also have benefited from accepting that I had developed traits of Vulnerable Narcissim as a way to deal with them and the overt superiority of others in many areas. By accepting that the scientists concerned with the mind and behaviour of people get many things right, and that there really is such a thing as what was known formerly as a Superiority Complex and is now known as NPD, I have improved my relationships with everyone I know.
This doesn't negate that oftentimes the person afflicted mentally or physically, or just unwilling to have a mediocre life without the people or things they want has the option to suppress their existence and that is a perfectly valid and rational decision. It's just that for the sake of improving (if that's what you are trying, and you aren't firm on ending your life) taking a 'me, the problem, and I control me' approach is empowering, while 'me, the victim of circumstances, that I can't control', which of course has enormous truth to it, is disempowering.
I disagree with that, I agree with the idea from the medical field that any prolonged and life-threatening mental condition is an illness. Be it anhedonia, depression or anxiety, if many of the people of my generation that are physically unattractive and have dysfunctional families are not cripplingly affected by it, whereas being ugly and having shit parents floundered me, that definitely means there is something wrong with me and that recognizing that would be the first step at trying something (if you want that and not just spare your suffering with death, but at least lets admit that we were worse psychologically equipped than others i.e. mentall illness).
This doesn't mean that I don't have a catastrophic constellation of circumstances in my life that I can't control. I'm looking at a winter of illness here. I'm talking about 3 months of having symptoms of cold or feeling every fucking day that you're going to catch one, it really is debilitating. I have unfreshing sleep and every year I seem to get weaker and less present. I can't deal with the cold apparently, I suspect my body can't use calories well as that is how sleep deprived mice died in one of those callous experiments eggheads do. I feel like I am vanishing, like Alzheimer patients do. I haven't felt a thing with ejaculation in 11 years. Suicide is not unlikely.
But I do know I can theoretically control and improve my social anxiety because it IS a "medical condition", a warped sense of threat that is delusional AND THEREFORE a mental illness. That's an example of something that ruins my life and that is workable. I haven't found any relief for the sleep torture that is slowly killing me.
And to make this personal, my favourite cousin sexually abused me when I was a kid. Not only that, he terrorized me, holding me by the ankles above a height large enough to kill me while I cried in panic. I loved that person dearly and the memories of abuse where suppresed until I was 17. I think he damaged me perhaps irreparably with what he did and more considering that he was like my big brother. Do I consider my social anxiety, derived IMO from that trauma and then snowballed with downstream experiences, a mental illness? I certainly do. Not everyone is out to abuse me, I don't need to fear everyone, and yet somehow that experience was burned into my emotional make up and has ruined a large part of my life. THIS is a clear cut specimen of what "mental illness" is.
First of all, I want to say that I am truly sorry for what has happened to you. That is horrible. This took a very personal turn, so I will try to be as respectful and tactful as I can, without censoring myself.
I think this whole debate is turning into a semantic disagreement. To you, 'mental illness' is an umbrella term that covers what I consider to be 'vulnerabilities', 'coping mechanisms', 'personality idiosyncrasies', 'reactions to traumatic events'...
Now, what I'm about to say might be controversial, but I noticed that many people have an over-attachment to psychiatric labels, because taking a hard, cold look at their lives would be devastating. The human experience can be brutal. Sometimes, those diagnoses become a way for us to blame ourselves: "I am the problem, I am the one who's sick/defective/broken". (you said that for you, this is empowering, but I don't see it that way)
It can be very painful (especially for highly sensitive individuals) when we realize that the ones we loved and admired the most were in fact terribly flawed... However uncomfortable it may be, I think we need to look at our family dynamics (especially parent-child relationships), at our traumas, at our unique personalities and reactions, at our conditioning, at all the expectations that were put on us, at our unmet needs, at our repressed feelings, etc.
Even if this is an unpopular opinion, I do believe that certain terms are overused and certain conditions are over-diagnosed/over-medicalized, especially depression, anxiety and personality disorders.
Having said that, my goal here is not to be dismissive or argumentative for the sake of it. Perhaps your anxiety is indeed a true illness in the medical sense. Your feelings are completely valid. As you stated, it's also the result of your traumatic childhood experiences (and possibly of your ongoing trauma). I don't want to pry, but how is your living/family situation now? (you don't have to answer if you don't want to)
Personally, I've never come across anyone who has had a truly fucked up childhood that wasn't deeply affected by it (of course some people are more
outwardly functional than others).
At the risk of repeating myself, there is a lot of binary thinking in your reasoning. You seem to believe that on one side there are the strong, healthy, well-adjusted individuals and on the other side, there are the 'sick' people. There's no in-between, no nuances. Also, your definition of mental illness is almost all-encompassing; any small deviation from an arbitrarily established norm is considered pathological. If you even include 'high expectations' and 'unhealthy coping mechanisms' in your definition, a majority of the population would probably fall into that category.
I am not denying the fact that some experts who work in the fields of psychiatry, psychology and sociology have good insights and publish thought-provoking papers. Human psyche, consciousness and behavior patterns are fascinating topics that absolutely need to be studied more.
Again, I am truly sorry for what you're going through. It sounds like hell.