Without my husband (who is marginally on the spectrum so understands me) and some family, I would be entirely alone. I'm not close to those in my family either. We get together a couple of times a year for a couple of hours only. I have had no "friends" since school, and even then, as tetris said, they were only school/university friends. I never did anything with them other than school.
I had one same-sex friend in my university years. I don't know why we connected, but we sure did. She suffered from kidney failure and was always dealing with transplants and dialysis. I always wondered if that gave us something in common, that being that life was more difficult for us that others. She ended up dying of complications related to kidney failure. So, I know what it is to have a good friend, but that got taken away.
I would love to have a friend. But I am so far away from knowing how to do the social dance at this point in my life, it is never going to happen.
My husband and I met in our computer/programmer geeky stage of life and again the bond stuck. Thank goodness for him.
I understand how alone it makes one feel.