@CandleCutter77,
Go to your doctor and get tested for autism. You'll have answers and you may be able to get treatment or at least a plan.
As for the rest of it, I suspect you just haven't found your tribe yet.
Let us assume, for sake of argument, that you're into
My Little Pony. Whether you truly are or aren't (or have never heard of them) isn't the point; this is just for illustrative purposes.
If no one around you likes MLP, then no one is going to want to talk to you about it.
But you're lucky to be living in this time period, because there's a whole wide internet out there. There are FB groups and websites dedicated to MLP. I'm certain there's at least one wiki.
There may be conventions, even if they're not in your area.
Long story short, those people would be simpatico to you. They are your tribe.
Now substitute Shark Week or the song stylings of Ethel Merman or hiking in the alps or whatever it is you like to do, and go forth online.
Find. Your. Tribe.
It's out there.
But first, see your doctor. You're probably right about autism and confirmation from a medical professional can't hurt.