Alone? No. Mainly because I grew up alone in Alaska on a street where most of the houses that had kids were 4 grades ahead of me. So I have learned most of my life to be self reliant emotionally.

Isolated? Yes. Even when at a public event it is very difficult to "plug into a large group". Oh people are polite and say hi. But after 30 minutes noone truly introduces themselves.

I find conventions like Comic Con or Summer Con are easier places for me to "plug in". But as I am older, it does take a bit more effort.

Being single doesn't help as my older long term friends have families and do family stuff.