Helmets are cool, really. They come in all colors and styles. It is the safe and legal thing to do and the people harassing you are basically immature jerks. Wearing a helmet beats the possible alternative. Brain damage or death. Your choice. 

Chances are … your parents are requiring you to obey the law.  Most states require bicyclists to wear helmets - and you can be ticketed if you don't.

Agra, India.