You’re worried because your body is changing.
But that is completely normal.
The bodies of all girls and boys change as they grow up.
This is what will happen over the next few years:
You will now produce sex hormones in your body.
Hormones give new information to your body.
They tell your body what needs to change.
This time of change is called “puberty”.
Hair will grow under your arms and in your pubic area.
You will sweat more frequently.
You may get spots on your face and back.
Your hair will become oilier and should be washed more often.
You will get your period.
Your breasts will start to grow.
Your nipples will become larger and darker.
These hormones will also make you feel very strong emotions.
Sometimes you will feel very sad, sometimes very angry and sometimes very happy.
That is all part of puberty.