Even though 12 is the average age for your periods to start, the normal range is between 11 and 16 years old. Your mum’s right, the age you start depends a lot on your genetics but also your body mass index. Breast size is mainly determined by your genetics and also your nutrition (ie. a healthy balanced diet). Your period usually starts about a year after the start of breast development but this can vary. It usually takes 3-5 years to complete. So if you haven’t started your period yet, your breasts still have a lot of developing to do. Tampons are not recommended to be used unless you have your period. When it comes to putting a tampon in, you’ll find it easier once your period comes and provides some lubrication. When that happens follow the instructions in the pack and RELAX. Inserting a tampon should be very easy. The muscles of the pelvic floor are very strong, so if you’re not relaxed, it will be very hard to put the tampon in.