I’m sure you are feeling anxious because many of your friends have already begun to menstruate and I can understand that. No teen wants to feel “different” from their friends.
But you know, every individual girl’s body matures at its own rate. It’s not unusual for some girls to not start their periods before they are 15 years old and others get it as young as 8. Normally a girl’s period will start within about 2 ½ years after she shows the first signs of puberty such as the development of breasts and pubic hair.
One sign that your first period should arrive within the next 6 months to a year is the development of a vaginal discharge. Look at your underwear sometimes when you go the bathroom and see if there is any white or creamy-colored mucous-like material collecting there. If so, the time is drawing nearer for you to reach that next level and begin menstruation.
How old was your mother or sisters when they started their periods? If any of them was also late bloomers, your slow start is probably genetic. If not, there are other points to consider.
Occasionally there are issues such as a hormone imbalance that may delay the beginning of menses. Some girls who are underweight, who are missing essential ingredients in their diets, or who have eating disorders such as anorexia nervosa or bulimia may develop later than others. Extremely athletic girls may also experience a delay in their first period.
At the age of 14, it really is too soon to worry about the situation, but if it will ease your mind, a trip to the doctor or pediatrician may be in order. He may perform a blood test or other simple exams and be able to reassure you that all is well. There really is no need for concern unless you haven’t started by age 16. When it comes to “why haven’t I started my period”, what you need most right now is patience, so just relax and wait with patience, that day will come.