Hey man,
you don't need parents to tell you about the world and life. Anyone with experience can do that. After you turn 18 bone out, she doesn't need her growth to adulthood hampered and stunted by someone that possessive and over baring.
Move out on your own. Get a job. Then come get her. She will also need a part-time job at least, people gotta eat. Together you should be able to afford a car, a place, and some fun on the weekends. The world is a big scary place and there are no rules, that's part of why they at least try to enforce the law. Be strong and keep your wits about you.
At first it might seem a lot harder than it sounds, but if you get practiced at it it will become as easy to go to school and work and pay bills and rent as it is now to get up and get dressed. Practice.
Don't let the hashness of the unrepenting 30 day cycle come between you two no matter what. It happens to a lot of couples that start out together, but if you remember that being together is the #1 important goal then you can come at everything as a team.
You can do it. Always search for the answer to the question, "What is man?" And "Do" without thinking. It's gonna be easier than you thought in the end.
Peace brotha.