There needs to be a negotiation between you and your parents. This talk should be a series of conversations to figure out the roles and responsibilities of each party as you move into this new phase of life. I have included a sample set of things to discuss, but you will need to adjust this to your situation. This will be a difficult topic to discuss, so be ready to work at this. If you have a good relationship with your parents where you can tackle difficult conversations you are halfway there! If your family avoids conflict at any cost, this topic will be extra hard but not impossible. You may need to keep coming back to the topic as you get derailed. If you have fought a lot and that is the end result of most of your conversations, you will need to do some work on the relationship.
Are you a whiner? Do you throw a tantrum when you don’t get your way? Do you make a lot of promises or swear to show that you really mean it. If so, then you will need to learn to state your position in a less dramatic way, or you won’t achieve much in these negotiations (Matthew 5:36-38). You will need to work at this, because the stakes are high. The most important thing is to preserve the relationship. You will need to decide many things and you will often disagree. There needs to be a plan for how to do this. When conditions change, you may need to go back and renegotiate your agreements. Just remember, it is wrong to expect total freedom.
You will need to delicately explain your needs and expect some freedom, but you should defer to your parents wishes when there is a disagreement. If you are in a current state of open rebellion, partying and out of control, you will probably lose support very soon, but I think most people reading this are rational and fairly self-controlled. The problem is that momentary losses of rationality can have huge implications for your future, so your parents probably know your limits and what boundaries are appropriate for you.