What makes short men insecure?

Sorry if this seems like a dumb question! Is it they feel other men look down upon them? From being made fun of as a child? Due to worry that women won't find them as attractive as taller men? What is it really? Or all of the above.

I just want to state that obviously not all short men are insecure...kudos to them!
What makes short men insecure?
Post Opinion