I just graduated with a BM in vocal performance. I'm currently living at home with my parents. I made the decision in order to save money, but I can't lie, it generally sucks.
It's not easy. As long as you're still living under their roof, they will still view you as their "child" and you likely won't feel that total sense of indepence as an adult that you would desire. The best you can do is assert yourself when you can while being respectful at the same time. Unlike you, I'm trying to hold down that "boring" job while out auditioning for performance roles. (I'm currently a TA at a local high school) It would be great to have total flexibility and not worry about my "9 to 5" job, but the reality is that there are bills to pay. Also, by saving money not only does it help me create some indepedence from my parents, but it also helps plan towards getting out in the near future.
At the very least, now you know you're not alone.