How can I get this girl?

Hi. I won't lie, I'm a 15 year old high school student. I used to get bad grades in school. I'd slack off a bit and do nothing for my future. Then I met her. She's short, extremely smart, and extremely cute. She's always been an inspiration for me to do better. She used to like me, too, until she determined that I would be a disappointment. I knew I needed to change, and this was the last straw. My grades soared. I became a better student and a great viewer of other people's perspectives on subjects. My life turned for the better. I recently re-approached her, and we hung out. Her parents and siblings adore me. She cuddled with me when we watched scary movies. Everything was looking better and better! I explained how much I've changed because of her, and I asked for another chance. She responded with "I won't even remember your name in ten years. I'll leave you in a million pieces and be off to study in India and lead a successful life. Plus, the fact that you are trying to impress me will automatically not impress me." I am determined that she is the girl of my dreams, and I know that the improvements in my life were NOT just to impress her, although this is what she believes and sticks to, no matter what I tell her. She prefers a guy who was born with the devotion to be great than a guy who realized his life needed to change, and then took action, but isn't choosing much harder and more admirable? We are planning to see a movie soon. How can I woo this beautiful girl?