A lot of girls don’t have their first period until they’re 16-17 years old, and given that you have clear signs that your body is developing, you have no need to worry. Your period will come, but it’s always useful to talk to a school nurse if you feel uncertain about anything. Yes, there probably are a very few women who never have periods. But this is caused by special illnesses that disrupt your hormones and which can, in most cases, be corrected by taking certain medicines.