Feeling lonely has little to do with how many friends you have. It’s the way you feel inside. Some people who feel lonely may rarely interact with people and others are surrounded by people, but don’t feel connected.
In general, those who feel lonely actually spend no more time alone than do those who feel more connected.
Three Factors Of Loneliness
According to Cicioppo and Patrick (2008) how lonely people feel seems to be a combination of three factors. The first is Level of Vulnerability to Social Disconnection.
Each individual has a general genetically set need for social inclusion and your level of need will be different from someone else’s. If your need for connections is high, it may be difficult to meet.