How do I deal with my parents?

Long story short, My parents are always saying how selfish I am and I dont appreciate things. I just got finished with my senior year in high school and didnt really enjoy it because I really couldnt participate in none of the senior activities because of "money problems". I always consider my parents feelings and I dont ask for money or things because I know what they are going to say. But for us to be having so many money issues my mom is always coming home with new dresses and new shoes or always getting her hair done to go NOWHERE! And my dad acts like he's scared to say something. I havent gotten anything, and Im basically getting forced to go to Texas for school and I dnt want to leave where I am at. But its like I have no decisions in my life and its been like that since I was little. And what really makes me mad is that you can go and spend money on all these things that are not important and you knew my prom and graduation were coming up & you make me wear someone else's prom dress, drive someone's elses car, and try to get my hair and things done for as cheap as they can. Im being as generous as I can but if I ask for 10 dollars they start tripping on me. I dont get it!!!! My friends dnt even ask me to hang anymore because I always have to come up with an excuse because they never wanna let me go. But when I look for jobs and my own car they get mad saying im being selfish and I dnt need anything that bad. Please explain to me how Im being "selfish" and how I can fix this issue with them.