Well, actually, you do have reasons to feel depression, if you are autistic. Autism is one of the low-dopamine neurological conditions. There are at least 3 known genetic mutations in autism that affect dopamine production and turnover. It is, in part, the reason for why little "slights" against us can hit us so hard and push us into those depressive moods, low self-esteem, rumination, self-deprecation, etc. The neurophysiology can be complex. For some, the underlying mechanism is low brain serotonin binding and turnover creating a downstream low dopamine, for others, it's those gene mutations affecting dopamine, itself. The bottom line is that some of us, like me, may simply have a "flat affect", perhaps a mild "funk", and it doesn't seem to be in the realm of "clinical depression" per se, and there are others, that it really hits them hard, sometimes to the point of suicidal ideation. I couldn't imagine the depths some people live in. Those feelings are real, brother, but do know there is a reason for it. I wish there was some magic wave of the wand to make it all go away.