...scared to be alone.

Me too. Its just part of anxiety disorders like yours and mine. I used to go sleep in my little sisters room when I was a boy. My parents did not approve so I found ways to do it without them catching me. Negative scary thoughts always filled my head when trying to sleep alone. Now, I could not imagine living alone. Have always (and do now) lived with at least one person. If I didn't, I'd probably not get any sleep.