Want fo become vegetarian

Hi girls, so I'm 16 and I've recently decided to become vegetarian gradually (not all at once since it would be pretty difficult for me). I started about a week ago but my mum keeps telling me that she's against my decision and that I will have to wait until I'm 18 to become vegetarian. She also says that it will affect my health since I've been used to eating meat since I was born.I have done some research online to reassure her but she says she wants to consult my doctor about it(which I'm ok with). I just really wanna know what you think and if I'm in the wrong for wanting to become vegetarian against my mum's will.