Many people look to others to define who they are. They're afraid of the introspection to find and define themself. When one's core is other-based, that person will always need to have the physical presence of other people or they feel alone. Emotional presence is not as important as the physical; these people are "validated" only when someone else pays them attention, whether through anonymous sex or online chat. Left alone with themself, there is nothing.

People who are self-defined are less likely to be lonely, because they always have themself.