I have that "child amongst the grown ups" feeling a lot. I feel like it gets worse as I age - the difference between me and the peers that I grew up with gets wider year by year as they accumulate experiences that I will probably never have. I just want to crawl under a rock when they start talking about their partners, children, mortgage, car, career etc. - for sure, I am pretty introverted, but it is difficult to be any more extrovert when I have nothing of substance to add to the conversation.
I also know the lack of understanding from therapists. They all seem to assume that there is a normal "grown-up" me hidden inside which will be revealed when whatever anxiety or depression is lifted. They never understand that I never learned those aspects of being a human being to begin with, so there is nothing to reveal.
I find it strange that autism is never considered to be a "learning disability" - as if "learning" only applies to academic knowledge but not social knowledge. My "blindness" to social cues seems as profound as the difficulties that friends with dyslexia and dyscalcula have with words and numbers, but my difficulties are always assumed to be "just" a "mood" disorder. If I point out my lack of intuition or experience, it is assumed to be purely "negative thinking", as if some hidden reservoir of knowledge and instinct will magically appear if only I had a more positive attitude. Frustrating!
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When you are fighting an invisible monster, first throw a bucket of paint over it.