think of yourself as standing in a dome, at the moment the dome is full of a dark smoke like substance made up of dark thoughts and negative feelings which are obscuring the view of you by others. concentrate on clearing these thoughts and feelings by doing things which you enjoy or which confirm the good things about you, once you feel better about yourself the dark smoke will clear and people will see the real you and be more likely to want you as a friend.
unfortunately people often do not know how to be friends with people who do not like themselves as the negativity rubs off and makes them feel bad too.