@backworldman,
These thread reminds me of a classic
Peanuts strip, wherein Linus (?) is talking to Charlie Brown, and he says, more or less, "Have you ever suddenly felt lonely in a vast crowd of people, like, say, at a mall?" And Charlie Brown replies, "I feel lonely when I'm all alone."
Loneliness is an emotion like any other. There are times when we want to be alone with our thoughts. I am the kind of person that does that frequently (as I'm sure many others on this board are), but, like any other emotion, through overuse it can evolve from being calming and positive, like a passive form of meditation, to being negative, a constant reminder of one's lack of some sort of desired social relation, in my case usually a close girlfriend. In this way it's negative.