There are two ways by which you as a student looking to apply and be accepted to the college of your choice can stand out qualitatively. You make your mark quantitatively by your GPA and your SAT / ACT scores. Qualitatively, you stand out by your extra-curricular activities and community involvements AND your essays and personal statements.
Admissions officers read your essay to learn more about you, who you are, what you have experienced and most importantly what you have learned from your experience.
People are not interested if you think that you are Superman or Superwoman. People will not pay much heed if you hide behind being too self-effacing.
Find your voice, express your feelings, share your understandings. The personal essay is where you can tell the reader who you really are.