How can I deal with the problems between me and my parents?

OK,So recently I have changed a lot, and my parents are taking it all in kind of difficult. I have went from shopping at Hollister, Abercrombie, and A&E, To shopping at Hot Topic, Pac Sun, and Rue 21. I went from listening to rap music to listening to screamo. Just....I have changed a lot, and my parents just don't seem to accept that. It's really hard too, because they treat my differently and they even think that I'm like...some sort of Satan worshiper or something, which i'm NOT. I am Christian. It just kind of gets annoying and makes me sad that my own parents don't have faith in me anymore, and I don't know what to do. I mean, I still act the same. I keep my grades up. I just have different interests now. My mom won't even let me wear eyeliner or dye my hair because she thinks that those things are too "wild". WTF?!? What REALLY gets on my nerves, is that my parents don't let me be myself. Is it the end of the world if I want to wear eyeliner or dye my hair? NO! It's torture not being able to express yourself for who you really are. It's like you're in a cage and can't escape. When I ask my parents why they don't let me dress how I want and etc, they say,"Brittany,The way you dress affects your whole life. If you dress in these dark colors now, then ppl will judge you and won't accept you. They will think you are some sort of trouble maker and won't wanna be friends with you. Your teachers will automatically hate you and you won't get into college, then you won't have a good job, and then you will be screwed." WTF?! The truth is that my friends have stuck with me through me changing like this and still think i'm the best. I have A LOT of friends. My teachers LOVE me and I NEVER get into trouble. I am a very nice kid and my parents just don't seem to beleive that anymore. What my parents say is "protecting" me, Is really just torturing me. No one judges me, but apparently me parents don't see that. There is nothing wrong with expressing yourself but i guess my parents think that there is. Just PLEASE can anyone give me some advice and help me convince my parents that letting me express myself how I want is a good thing!!!