It sounds like this has been asked before. Regardless, the answer is no - you cannot be emancipated in the State of Wisconsin. However, if you are the victim of abuse, you can (and should) contact the police.
It sounds like there is a lot more going on here that what is asked in this question, and I would encourage you to talk to someone outside of the situation for help (teacher, school administrator, etc.).
In accordance with the Avvo community guidelines, this communication does not constitute "legal advice", nor does it form an attorney-client relationship. You should seek counsel in your geographic area regarding any specific questions.