What are some common habits or behaviors that might accidentally lead someone to feel lonely, even if they're surrounded by people?

Do you still re-read your favorite childhood comic books?
What is the first emotion you typically feel when someone attempts to shame you for your personal choices?
Measured by economic output, France has the third-highest debt ratio in the European Union at 114%. Why before Greece and Italy?
Why is the journey of proving something considered more important than just proving it's true?