how to convince my parents into letting ride my bike without a helmet?

[guess my name!bet u cant]

i cycle on th road but no one else wears helmets and nothing ever happens. i never fell off my bike.
bob A my parents don't smoke and they wear their seat belts.
stop with all the mean topics! i was just angry that i had to wear one all the time ! i'm going to keep wearing one. but everyone being really mean and making me feel like an idiot!