How to write a personal statement for college?

I recently applied for college and one of the requirement of the admission process is to write a personal statement. I have never written wrote a personal statement in English before and I am worry of worried about not being able to do it correctly. What is the most important thing that I have to take in consideration when I write a personal statement? What is the correct format to write a personal statement? How long should it be?

The most important thing is that it needs to be a personal convincing story of why you want to go to college and why you chose that specific university.

There is no correct format. Whatever it takes to tell a good, captivating story.

And how long? Long enough for it to be a good captivating story, but definitely not 10 pages long either. When we were reading admission letters, most were one page or two pages. 

Just google, "sample college personal statement" and you will see many examples.

http://college.usatoday.com/2012/01/09/six-tips-for-writing-great-personal-statements/