Just wait for it. If you haven't reached puberty at 18 you should see a doctor but until then you have nothing to worry about. Don't worry, it will come.
Why do you make it sound like some sort of disease? If you have puberty your finally a teenager or an adult. Congrats. You'll go through changes and I'm sure your parents will understand. For girls:...
Well, it depends if you are male or female. In a male, the first step in puberty may not even be noticeable. The first stages in a boy are (in order), an increase in testicular size, a thinning of...