We ARE all alone. We are born alone (well except for Mom, but she's having an entirely different experience). We die alone. We can enjoy an illusion of camaraderie in between. But if that illusion ever makes you doubt you are alone .... take up a collection. :-/
Absolutely alone? No. There will always be people who share your beliefs and opinions. You might not physically meet them, but you can find them online. Despite saying that, I wish there were more people who shared my beliefs/opinions who lived closer to me. It would be nice to actually hang out with people.