Ephraim, my heart goes out to you. You’re a sensitive man who’s looking for acceptance in a world that shies away from open and honest discussions of mental health. I respect you and commend tou for that, and for still keeping the mitzvos despite feeling out of place in the frum community. Chazal ve’amatz!
I would caution against associating with a group – any group – solely on the basis of their rumored level of acceptance of people with ASD. I’d suggest rather, a yeshiva or particular shul that is such, and that is on the same level of your own observance (or oerhaps a step above – we all want to grow). Rabbi Moshe Wise (not to be confused with rabbi Moshe meir weiss) has a beis nedrash in marine park where there are several types of young frum men, some of whom are on the spectrum; maybe you can look into learning there at night?