I can't be myself! Help!!?

I'm a 15 year old girl and I'm going to be a sophmore in high school next year. I go to a private school where we wear uniforms. But that's not my problem. It's my mother. See we have sports games and free dress day were we can dress how we want in our clothes. The problem is my mom won't let me get the clothes I like. We can never agree on anything. I usally have to get clothes that I thought were the least hidious she liked. She knows I don't like things she likes and my grama told me they were the same way. See I like 80's type clothes, like big t-shirts that are to big but are cut short with a wild color tank top. And ripped jeans or shorts. Also with heels or converse. I also like laid back rock. Like plain v-neck tshirts, or tank tops with Jean shorts and heels r boots. I love fashion alot and live looking at magizines for ideas but my mom won't let me do any of it. I understand the heels somewhat cause she says "I'm only 15". But I don't want to wear boring cottage looking clothes that scream "hey my mom picked this out!". I also have really curly hair! I love to straighten it but it's sooo long and not layered. But my mom won't let me cut it or get it layered! And it's not because of the money cause we have plenty.....I was thinking if I got a job somewhere and earned my own money if she let me buy my own clothes as long as they weren't "bad". But idk if it work?! Is there any other ways! Also with the hair. Even if I pay I still don't think she'll let me get it cut and layered. And I ry want to. Oh also. I have my real dad that I used to viset alot but my mom won't let me viset him and I know she's not suposed to do that because of the divorse papers. He let's me express myself unlike her and is alot cooler! But she won't let me go over! And if I'm caught texting shell yell at me! And take my phone away!