Actually, you are quite right. "Atypical Depression" or "Depression with Atypical Features" (2 terms for the same diagnosis) happens to be the most common form of depression. Historically, it was called "atypical" by way of contrast to "Melancholic Depression," whose "typical features" were considered to be as follows: inability to be cheered up my positive events, or by supportive gestures by others. So called "typical" features also include difficulty sleeping or insomnia and lack of interest in eating. "Atypical depressives" are inclined to both sleep and eat too much.

Here is an explanatory link: Atypical Depression Symptoms, Treatments, and Diagnosis

Another article I saw refers to the term "atypical depression" as being a misnomer. It involves an theoretically driven use of language that is counter-intuitive.

I tend to be skeptical of that whole diagnostic taxonomy that modern psychiatry uses. (For instance, I consider "Bipolar Disorder" to be a waste-basket category, into which doctors throw various pathologies that may have little in common. To say someone experiences wide mood fluctuations because they suffer from "wide mood fluctuating disorder" sounds to me like circular thinking that contributes nothing to our understanding. I recognize that some people alternate between widely varying affective states. That's an observable fact. It does seem to qualify as being rooted in a pathological condition. But I would call that a symptom. There may be differing pathologies causing that symptom in different people. By way of analogy, "epilepsy" is a syndrome, but it is not a diagnosis. (You will find that statement in medical textbooks.) The taking of seizures can be caused by various pathologies that have nothing to do with each other. If a doctor were to say, "I diagnose you as being epileptic.", he would essentially be saying nothing, other than what any fool could observe. An explanatary diagnosis would be one of the following: seizures due to alcohol withdrawal, or seizures due to a brain tumor, or seizures due to a very high fever, or seizures due to ingestion of a toxin, or seizures caused by traumatic brain injury, etc. etc. Those are diagnoses. To say: "You are having seizures because you have a seizure disorder." is a tautology, defined as words put together in a grammatically coherent way, which say nothing meaningful.

Psychiatrists get away with a lot of that, IMHO. Bipolar is a word with 2 Latin roots that has applications in the realm of physics. Psychiatrists have appropriated this word to impart a scientific luster to one of their more half-baked theories, IMHO.
Also, it connotes physicality of cause, which is the larger (also somewhat half-baked) paradigm within which current psychiatry fancies itself to be operating.

Well, that was quite a tangent I went off on. Where I was going was to say that, though I find the taxonomy used by modern psychiatry to be rather a shakey system, I did find that my own symptoms line up pretty nicely with what is delineated in the concept of "Depression with Atypical Features."

I could really use some of those "positive experiences" to bolster up my flagging mood. Unfortunately, "the whole situation in which I find [myself]" offers little that holds any promise of doing that.

I really have to pull myself together. So far today, I have accomplished n o t h i n g.