And since then we haven't had any sexual interactions and I am now 18 can she press charges on me of any kind?
Yes she can. You are correct to be concerned. The fact that since that time you have not had sex does not erase anything.
I believe the statute of limitations on that would be one year. If more than a year has passed since you had sex with her she can't do anything.
An individual cannot "press" or "drop" criminal charges in California. That decision is left to the prosecutor's office. You can file a police report. The police will investigate and forward their reports to the prosecutor for review. The prosecutor then decides what, if any, charges they will file.
There are some statute of limitations that apply, but those vary with what type of activity is alleged. It may be a year, but could be longer.
Your first and best line of defense is to keep your mouth shut. No discussions with anyone - not the police, your buddies, online, her.... not anyone.
If contacted by the police, request a lawyer.
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