Believe it or not, this is a real medical problem.  Finally a group did a study about men who were ashamed about their penis size.  In order to do the psych assessment, they created an "assessment tool".  Really. As a researcher, I don't even want to think what went on in the lab.  Here is the link.   http://onlinelibrary.wiley.com/doi/10.1111/jsm.12294/abstract