I didn't feel alienated much. No problem at all till I was about 9, then my social life got somewhat precarious, which I largely put down to my neighbourhood playmates having mostly moved out of the area and my going to a new school at the far side of town. But I didn't particularly want to be in with the "in crowd." I was content with one pal at a time, and always seemed to find one. Then I got in with a couple of groups of "progressive" types, and related to them very well. So I'd developed a healthy contempt for mainstream groups and always got my jollies from the fringes of society, particularly hippies, lefties, and bohemian types, and back then (late 60s and 70s), it was beginning to look like we were going to have the country run our way.
And I'd somehow learned to relate fairly well to girls / women of the right kind for me. So although I've never felt especially confident of my ability to avoid being friendless or partnerless for too long, my track record at least has always looked fairly good. I see my social success level as a raft - hard to completely sink but my feet can get wet if I don't watch out. I was also lucky to have acquired enough music skills to impress people and open social doors. Without that I'd probably have sunk without trace decades ago.
These days the hippies, lefties and bohemians are in rather short supply (especially in Arkansas), but I'd been gradually switching my view from "HLB are the only people for me" to "I like friendly people," and in the Arkansas countryside there are lots of friendly people. I still find myself being alone too often to stop me feeling lonely, but it's more down to unfortunate circumstances than to autism. And when I do a lot of socialising I soon start longing for a bit of space. People are one of those things I can't quite live with but can't quite live without. I wish I had a switch for my social life, but people tend to think I'm not interested in them and drift away if I just pull the plug whenever I want to. Can't make an omelette without breaking eggs.