Assertiveness requires boldness that most low self esteem do not have. They are often too fearful to tell the truth or what they want, or share their feelings. They are withdrawn and isolated & feeling embarrassed, humiliated, devastated, depressed. To cover up their short comings , they may become aggressive,defensive, sarcastic or rude, even violent such as is the case with domestic, gang, and teen violence.
— Dr Anil Kumar Sinha
Assertiveness