Daisy answered question 4/8/2009 I'm 14 And Haven't Started My Period. WHY? I Have All The Signs Of Puberty But Just Haven't Started. I Know It's Mad But I Want To Start Because All My Mates Have And I Feel Like A Baby. Please Help Me. I Wanna Know When I'm Gonna Start. Many girls get their periods at different ages but you might need to go to the doctor if you're seventeen and havent gotten it yet because it could be something serious but for the moment don't worry about it you might get it soon