Humlan, you sound like me. I will quickly say no to an offer to come along and keep me company then, when I get there, I look around and realize I'm the only one there solo. But it is a hard balance for me. Letting people in is good, comforting, healthy and promotes friendships. Even though I know this I would often just rather do whatever it is alone. I don't know why this is. Maybe a psychological glitch or just the only child in me. I have to force myself to let people in, once I do I'm glad I did it.