Unfair

My life is so unfair. My sister who dropped out of college was just rewarded by having my parents buy her a car. I on the other hand have made honor roll most of my high school career graduated with a 4.3 gpa recieved a scholarship and am in still in college yet my parents wont buy me a car. My parents made a deal with me, if i recieved a certain amount of money for college they would buy me a car, well i got more than what was required of me and my parents refused to buy me a car. Yet she drops out of school and gets a car! What sense does that make! I try my hardest to be the best and she doesnt yet she is the one who always gets rewarded. I get nothing and she gets everything. I am so sick of it!