I'm 17 and I still haven't started my period. I've had puberty signs, for instance. Pubic hair, arm pit hair and I've lost alot of weight in my face. I was just wondering if I should be worried? Also, since I haven't started my period. Should I be hesitant to mastrabate? What risks should I be concerned with. I want to talk to my mom about it, but she'll make a big deal about it and tell all her friends what we talked about. I could use some advice. Thanks!