How do I convince my parents?

I hate my school, everyone in it hates me, I was labeled as an outcast the moment I walked in the door. I tried to be nice to everyone but they just returned it with spite. I distanced myself from them and let my real personality out, dark, goth, violent, and suicidal. This made people distance themselves even more from me, and now people were complete jerks to me basically the whole entire year. However, at another school I have a girlfriend that goes there and many other friends. I have tried convincing my parents to move because its only about a 20 minute drive from my dads to there, but to no avail. When I'm around people there I actually feel a trance of happiness, but when I'm at my current school it feels like my soul has been torn out of my body along with all my happiness. But whenever I tell my parents that my school makes me want to die they laugh it off and act like I didn't say anything. an someone please tell me how to convince them? P.S. they say it's a logistical problem because my sister goes to a private school 20 minutes from where I want to go.