Can depression be an illusion?

I am unsure what I have at the moment, depression or burnout.

The main reason I think this is because I've given up bodybuilding, i've also become really angry, but i think that a lot of it is because of the external and anyone in my position would be pissed off, maybe many people think they have depression but in fact the problem is with the external and not themselves?

What if people that claim to be depressed are just blaming themselves and not their environment, because these days life isn't that great compared to what it used to be, the lifestyle isn't what it used to be, too many cuts from the government causes people to become like this.

I have insomnia now, but recently got into a good pattern of sleeping and it's better, I think maybe it's my sleeping pattern and not insomnia, what I did for this was went without sleep for a day, then went to bed at normal time the next day, I got back into the pattern.

I lost weight but only because I stopped bodybuilding IMO, but also I stopped eating as much, I think this is more down to my position of not having a good income, you have to eat less.

But I feel that maybe a lot of people say they have depression when they don't, it's just that their environment gives them the illusion they have depression, depression would be something chemically wrong with them, if you changed your environment it would go, depression should be lasting throughout all environments, you would know that it wasn't your situation but you personally.

I'll give two examples: One person is living in a rut, he gets little to no money from the government, without a job, without savings, without family or a girlfriend, he claims to be depressed.

Whereas the other is living in a nice home, a nice family, good income, with savings and a girlfriend. He claims to be depressed.

The second example is more likely to be depressed because the external is good, but the problem is with him, whereas the first thinks he's depressed, but if his circumstances were to change, he'd change, so there wasn't actually anything wrong with him chemically, it would persevere despite his circumstances.

This is the same with Buddism, it focuses too much on the internal and ignores the external, I think that despite developing a good internal, you are not really immune to the external, you kind of wake up one day and realize that life around you is #######5, and thinking positively is what's keeping you in the rut.

When I suffered from either burnout or depression -- I couldn't tell -- my doctor told me it doesn't really matter which one it is, as both are treated the same way. It worked, no matter which one I had.