There is a difference between being alone and being lonely. One can be alone in a crowd. One might not be lonely although not having seen another person for five days.
It is a matter of perception, of activity, of being comfortable in your own body.
Many people are not comfortable in their own bodies.
You can see this every day.
The woman cleaning her house, talking on her phone with the television on.
The person choosing to sit in a crowded section when there are solo tables available.
The man singing loud and attention getting as he walks along the road.
These are simple examples of people who hate their own company.
This is where one has to stop and analyse.