Walk around and you'll see different people starting at different times. Puberty has different affects for different people-some have major emotional issues and very little acne...some have a lot of acne and their emotions stay the same...it's different for everybody. Here's an article I pulled up from www.kidshealth.com
Time to Change
Usually, puberty starts between age 8 and 13 in girls and age 10 and 15 in boys. Some kids begin a bit earlier or later than that, and kids can experience puberty-related changes at any point during those years. That may help explain why some of your friends still look like young kids whereas others look more like adults.
One of the first signs of puberty is hair growing where it didn't grow before. Boys and girls both begin to grow hair under their arms and in their pubic areas (on and around the genitals). It starts out looking light and thin. Then, as kids go through puberty, it becomes longer, thicker, heavier, curlier, and darker. Eventually, boys also start to grow hair on their faces.
When your body is ready to begin puberty, your pituitary (say: pih-too-uh-ter-ee) gland (a pea-shaped gland located at the bottom of your brain) releases special hormones. Depending on whether you're a boy or a girl, these hormones go to work on different parts of the body. For boys, the hormones travel through the blood and tell the testes (say: tes-teez), the two egg-shaped glands in the scrotum (the sac that hangs under the penis), to begin making testosterone (say: teh-stass-tuh-rone) and sperm. Testosterone is the hormone that causes most of the changes in a boy's body during puberty, and men need sperm to be able to reproduce (be the father of a baby).
In girls, these hormones target the two ovaries (say: o-vuh-reez), which contain eggs that have been in the girl's body since she was born. The hormones cause the ovaries to start making another hormone, called estrogen. Together, these hormones prepare a girl's body to start her periods and be able to become pregnant someday.
It's Just a Growth Spurt
A spurt is a short burst of activity or something that happens in a hurry. And a growth spurt is just that: Your body is growing, and it's happening really fast! When you go through puberty, it might seem like your sleeves are always getting shorter and your pants are creeping up your legs. That's because you're having a major growth spurt. It usually lasts for about 2 to 3 years, and when that growth spurt is at its peak, some kids grow 4 or more inches (10 or more centimeters) in a year! At the end of your growth spurt, you'll have reached your adult height - or just about. But your height isn't the only thing that changes during puberty.
With all this quick growth, it can seem like one part of your body - your feet, for instance - are growing faster than everything else. This can make you feel clumsy or awkward. This is normal, too! The rest of your body will eventually fill out and shape up, and you'll feel less klutzy.