what should you do if you were brought here illegal as a child
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I wouldn't do anything until you turn 18. Then I would gather up whatever documentation you can obtain (school records, etc.) and check with immigration to see what you can do to legally reside in the U.S.
Depending on your age, you may qualify for one of the amnesty programs. If you have a SSN, just live your life. If not, you should apply for residency/citizenship.