• You will notice that you prefer staying in bed much later in the mornings than you used to. This is because your body starts producing more of a hormone called melatonin which makes you want to sleep for longer. Where you used to be able to leap out of bed in the morning beforehand, unfortunately you've now hit your terrible teens and will begin living in your pit.
• Your breasts should have already started changing by the beginning of your periods, especially with changes around the nipple. They will continue to grow as you go through puberty and will sometimes hurt around the time of your future periods, so look forward to that!
• You will also notice that you are growing more hair than beforehand, in places where it never grew before. You will get pubic hair and your underarm hair will begin to grow more frequently, so you may wish to start shaving. If you are not careful with your personal hygiene, pubic hair may lead you to start smelling due to sweat.
• Speaking of sweat, you will start to perspire more too, which isn't great. Just make sure that you buy a good deodorant and use it before you leave the house in the morning.
It may seem pretty scary right now, with all this talk of bodily changes and periods, but you'll be fine. Every woman goes through it!