I used to be similar to the OP in that for most of my life, I've found talking to children easier. Today, I find kids annoying and really prefer the company of insightful and mature adults. I'll also get along with people around my age if they are more mature than others. I really enjoy talking about ideas, feelings and deeper concepts as opposed to the pointless small talk that most people my age do.
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Given a “tentative” diagnosis as a child as I needed services at school for what was later correctly discovered to be a major anxiety disorder.
This misdiagnosis caused me significant stress, which lessened upon finding out the truth about myself from my current and past long-term therapists - that I am an anxious and highly sensitive person but do not have an autism spectrum disorder.
My diagnoses - social anxiety disorder and obsessive-compulsive disorder.
I’m no longer involved with the ASD world.