My parents let me down so much. What should I do?

I am 14 years old and going to freshmen. My parents are always letting me down on things. They bring my hopes up and then crush them down. They male promises and never fullfill them. I've just had enough. The first time, they said I'd go to osseo junior high, That was when i was 13. But then they said.I couldnt. Which completely broken me because i was so excite and happy I could die. The second time, I wanted to hold a party for my 14th birthday and invite my group of friends.but, that never happened. All because i had a friend who was black. I felt ashamed. The third time, which I'm now 14, i begged to go to park center high. They agreed.But now that its August. They tell me I can't. I had my hopes up super high. But they all crushed down the moment my parents lied to me. I dont know what to do anymore. I just feel so let down and everything. If I try to speak my opinion and feelings, I get yelled at, and what they call "disciplined". I can't even share my thoughts to my parents anymore. Why can't they realize that they've crushed my hopes so mmuch to the point where I can't even trust them anymore? What should I do? This may seem childish, but, I can't stand their lies and everything. Why do adults always abuse their powers? My parents are so unreasonable. I really can't wait until the day I move out.