The fear of rejection is perhaps the most common fear among people nowadays. Among this generalized category, the fear of social rejection is the strongest one. Nowadays, people tend to go to impressive extents only to avoid the fear of rejection from the society or from the peers.
This is because we all want to survive within our social circles and want to feel very important among our peers. To get over your fear of rejection, simply expose yourself to rejection and tell yourself that you are strong enough to survive through it. Exposing yourself to a fear is the only way to overcome it.