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Usually between the ages of 8 and 18 years old, your body starts growing and changing. These changes occur from head to toe, and are completely natural as your body responds to increased hormones. In girls, the main hormone guiding the body's new instructions is called estrogen. In guys, it's testosterone. All of these changes together are called puberty.
Puberty is the bridge between being a kid and becoming an adult. As you cross this bridge, your body and your feelings change a lot. You also may feel differently about your family, friends and classmates, and view the things that they do in whole new ways. You may feel like changing what you do with them, the way you dress and the things you talk about.
That said, GTFO of 4chan, underage B&.