can a medical bill from my childhood hurt my credit?

i am receiving collection notices from a dermatology bill from when i was 16. i was covered under my mother's insurance at the time. the claim was denied and put up for appeals. they called my cell phone (when i was a minor child) to harass me about the bill. i kept telling them to call my mother or her insurance company. now i'm 22 and getting collection notices about it, saying it is negatively affecting my credit. should this be considered my responsibility?