Over-Protective Parents

HELP !! I’m about to be 18 in 2 days and my parents still think I am 5. I’ve been in a 10-month relationship and I’m not allowed to go out with him other than to the gym (which is 2 minutes away from my house). We don’t get any privacy, or freedom and it’s drowning me. I already talked to my mom today and she says nothing is changing once I turn 18. What can I do?