Most likely, you will have to go back to Mexico and apply for an immigrant visa and a waiver at the US Consulate in C. Juarez. Because you came or were brought to USA illegally (and if no petition was ever filed on your behalf or your parents' behalf), you will not be eligible for an immigration process called "adjustment of status". It's irrelevant that you were a child at the time of illegal entry, under USA immigration laws.

You should not file any petition with the USCIS/DHS until you discuss your situation and legal options with a qualified immigration attorney (not a "notario' or "specialist").

If you’d like to schedule a telephone legal consultation, please let me know, and I’d be glad to help: Attorney [@] law-visa-usa.com

Note: The above response is provided for legal information purposes only and should not be considered as legal advice. This response doesn’t create an attorney-client relationship, which can only be established through payment of a fee. If a follow-up advice on your specific situation and regarding U.S.A. immigration-related issues is requested, we can offer a paid consultation by telephone or email to clients from all States and globally. Please visit our website http://www.law-visa-usa.com/contact_us.html for more details. Our contact email address is Attorney [@] law-visa-USA.com

You'll likely need to apply for a K-3 spouse visa in conjunction with an immigration waiver.

You may find detailed information on the process here:

http://www.msclaw.com/i-601-unlawful-presence-waiver.html