The general idea of the text is:

How to beat loneliness

Loneliness is a subjective feeling. You may be surrounded by other people, friends, family, workmates — yet still feel emotionally or socially disconnected from those around you. Other people are not guaranteed to shield us against the raw emotional pain that loneliness inflicts.

But raw emotional pain is only the beginning of the damage loneliness can cause. It has a huge impact on our physical health as well. Loneliness activates our physical and psychological stress responses and suppresses the function of our immune systems. This puts us at increased risk for developing all kinds of illness and diseases, including cardiovascular disease. Shockingly, the longterm risk chronic loneliness poses to our health and longevity is so severe, it actually increases risk of an early death by 26%.

There are many paths to loneliness. Some enter loneliness gradually. A friend moves away, another has a child, a third works a seventy-hour work week, and before we know it our social circle, the one we had relied upon for years, ceases to exist. Others enter loneliness more suddenly, when they leave for college or the military, lose a partner to death or divorce, start a new job, or move to a new town or country. And for some, chronic illness, disability or other limiting conditions have made loneliness a lifelong companion.

Unfortunately, emerging from loneliness is far more challenging than we realize, as the psychological wounds it inflicts create a trap from which it is difficult to break free. Loneliness distorts our perceptions, making us believe the people around us care much less than they actually do, and it makes us view our existing relationships more negatively, such that we see them as less meaningful and important than we would if we were not lonely.

These distorted perceptions have a huge ripple effect, creating self-fulfilling prophecies that ensnare many. Feeling emotionally raw and convinced of our own undesirability and of the diminished caring of others, we hesitate to reach out even as we are likely to respond to overtures from others with hesitance, resentment, skepticism or desperation, effectively pushing away the very people who could alleviate our condition.

As a result, many lonely people withdraw and isolate themselves to avoid risking further rejection or disappointment. And when they do venture into the world, their hesitance and doubts are likely to create the very reaction they fear. They will force themselves to attend a party but feel so convinced others won’t talk to them, they spend the entire evening parked by the hummus and vegetable dip with a scowl on their face, and indeed, no one dares approach — which for them only verifies their fundamental undesirability. […] 

(Source: Guy Winch, at TED Ideas. Retrieved at: http://ideas.ted.com/how-tobeat-loneliness/)