Inferiority complex is not diagnosable this not a mental disorder, it is a cultivated habit. If you are as a child bullied, scolded and not allowed to retort, argue your case or snubbed after a few years you get a set of inferior feelings about yourself. Usually, it is the over controlling parents or grandparents and extended family that kill our confidence and wreck us. This is similar to a mahout controlling an elephant with just a coir rope around its leg. Because it was already trained by using iron chain many times. The elephant instead of breaking free easily from this thin, weak coir rope continues to think sadly it is tied, with all its freedom lost. When this inferior feelings sit in your head, you are unable to move freely with people. You start doubting yourself and whether you are going to be snubbed, made fun of by the people around. This doubt kills your freedom of speech and action. Although your mind wants to speak out, your are rendered helpless because of your upbringing and the bullying people around. Fear takes over your mind. Those who feel they are having an inferiority complex remember it is only an invisible protective jacket. So just remove it ASAP and feel confident about yourself. You decide for yourself. Do not let others mind-control you. We are born equal and born with full freedom. If something or someone is wrong tell them. Learn to say No and Yes boldly. Happy freedom from the chains of inferiority complex.