Many great thoughts in this great topic.

Inferiority is always coupled with superiority. That's the first thing that comes to mind.

Another is that its always family issues. The only way to feel is to feel real and adequate - why feeling any other way?
But when you reject parts of yourself - desires, wishes, emotions, feelings - part of your energy is frozen, and part is wasted on trying to hold it back.

So if a big part of you is rejected then you are going to feel really inferior. Especially to people who accept this part.