I want to move out, but how can I? Help, please?

I know I've already asked this question, but I have more information. I recently told my parents I'm moving out to a nice place that's closer to where I plan on working at. From there it's 10 minutes compared to the 25 minutes here. I told my mother, as an adult I should make my own decisions and to do whatever makes me happy. However, she kept telling me that I have to make myself, her, and my father happy. They will not allow me to leave the house. I tried my best to calmy explain myself to them, but they immediately flew off the handle, yelling at me and telling me that THEY know what's best for me when the only person who should know what's best is ME. Because of this, I feel conflicted and haven't been able to sleep well due to much thinking that has lead me to have this killing head ache. I've been told to bring the police in if they insist on keeping me here, but I absolutely hate conflicts. At the same time though, I hate being tied down from the life I want to live. I want this to go down peacefully, even when I asked them to please stop with the yelling, they continued to do so.