Inertia

There are lot of things that keep us inside our own skin. And if you do decide to get outside of yourself, many times there aren't a lot of alternatives - places for you to turn. You can get on the internet and connect, sort of. Even then, though, it's digital and it ends when either party decides they've had enough or they don't like the way the interaction is going. It's hard to get a commitment from someone on the internet.

Newton said that an object will continue in its path until acted upon by an outside force. That means that it's hard to stop a moving train, but it also means that it's hard to get a giant stone rolling. It seems like the longer we stay on our own, the harder it is to overcome the inertia and reach out. We're not supposed to be alone, but there sure are a lot of forces to overcome.