You could possibly be charged with unlawful sex with a minor under Penal Code 261.5, but so could she. Would that happen? Who knows. But considering you are from Paradise, that would not surprise me. Rural counties tend to be more harsh than others.
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If you are mature enough to make a responsible decision about sex, you are mature enough to know that getting yourself and your girlfriend drawn into the State justice system and charged with crimes pertaining to sexual misconduct is a terrible idea. Most rational people recognize that 2 willing 16-year olds who engage in mutually consensual sex is not the crime of the century. But if there is a parent on the scene who can be predicted to make all of the potential trouble that can be made, then the evaluation changes radically.
Getting criminally charged will change your life, plain and simple. Either of you getting charged will change your life and your girlfriend's, too. It will cause the end of your relationship and can result in one or both of you being removed from your home(s) or being geographically re-located by family determined to act prohibitively. You are in over your head here with the forces of authority.
My responses to questions on Avvo are never intended as legal advice and must not be relied upon as legal advice. I give legal advice only in the course of an attorney-client relationship. Exchange of information through Avvo's Questions forum does not establish an attorney-client relationship with me. That relationship is established only by individual consultation and execution of a written agreement for legal services.
As both of you are under the age of LEGAL CONSENT  neither of you can consent to have sex. Both of you would be committing a crime. Unfortunately, it is almost always the guy who gets the criminal charge, I said almost always, not always. DA could potentially charge both of you.
The above is not intended as legal advice. The response does not constitute the creation of an attorney client relationship as this forum does not provide for a confidential communication.