It can feel awkward to mature faster than your friends however, not all young women begin puberty at the same age. Just like not everyone reaches their full height at the same time either. In general, girls usually begin puberty anytime between 8-13 years of age, so you are right on schedule! Some girls will get their first period at the same age as their mom did, but others don’t. As a rule, girls will get their period about 2-3 years after they notice their breasts are growing. It’s possible that other girls in your class have developed breasts and started their period but you wouldn’t know unless they told you.