One of the first things that boys notice when they enter puberty is the pubic hair around the genitals. Later hair In the armpits, on your arms, on your legs, and even on your backside. Hair is perfectly normal. Shaving hair is also normal. Don't be worried about what other people think. If you haven't grown any it will happen in time as you grow older.
When and how the penis starts to grow differs from boy to boy. The Testicles and Penis start to grow bigger. Erections are a flow of blood from your body to your penis that makes it expand and become rigid. This usually happens when you experience a sexual urge or feeling. These can be caused by anything.. and for no reason at all. Some guys have erections over girls, at this age erections happen for anything; getting naked, touching yourself or stimulating your genitals. They happen in locker rooms, in front of the class, in the shower, and everywhere else. Don't be worried or embarrassed about your erection. They are a part of life, and there's not really much you can do about it.
Puberty can start as early as 10-years-old for boys but averages around 12. You wont stop growing until you have finished and are around 20-years-old. Penises can take different shapes and sizes. When erect they can be curved upwards or to the left or the right. This is normal too.
When you hit puberty, you may get a sudden interest in girls. Erections are common at this time and cause your penis to get hard. Stimulating the penis with your hand or with any object is called Masturbation. When masturbating you rub the head of your erect penis. After awhile you climax and a whitish fluid called semen will eject from the end of your penis. How much depends on your stage in development. At first you may not have any fluids come out. Semen usually is a white sticky substance.
After masturbating, many boys feel guilty of their thoughts and what they have just done. This feeling is perfectly normal. Masturbation is perfectly normal and healthy.
You will grow taller and develop muscles as you get older. Your voice may deepen in tone and you may develop an Adams Apple on your throat. You will notice you perspire/sweat when exercising and your feet may become a little smelly. You will need to wash regularly to keep clean and smelling fresh. Your brain is growing in size and is giving confusing messages. Your facial features are more prominent.