The sheriff is correct. However, there is a process that you can do if you want to go into court to get the authority to move out at 17. It is called emancipation. There is a trick, however. You have to be employed, not relying on your parents for support, and you have to prove to the court that you can support yourself. Your boyfriend's parents do not count as self-support. A job that pays and living quarters that you can pay for are the most important elements. Bottom line, get permission, or stay home until you turn 18.
This answer addresses only general circumstances and is not intended to be actual legal advise. Before acting on this or any other information, please consult an attorney directly.
The Sheriff is correct. Asking a guidance counselor about the law is like asking the Sheriff about college transcripts. At 17 you are no longer under the jurisdiction of the juvenile court, but your parents are still in charge of you and legally responsible for you until 18. Barring emancipation, you would have to have their consent, and they could cause trouble for your boyfriend's parents for interfering with your parent's custody of you.
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