I need help about my scion tc.?

okay...last summer my parents bought me this cruddy scion tc..(im 16..dad has a lot of...erm dont wanna sound snobby..money) and i really hate it..ive ALWAYS been into mustangs ever since my bro had this old 5.0 supercharged 89 stang that he dragged..I LOVE EM!! And since the newer models have been comin out since 05..ive fallen even more in love with em..problem is...im stuck wit a teenage chick car..Heres what i want to do..i just got a job bagging at publix. I make about 450 a month...I want to be able to trade the tc (yea i know negative equity) and lease the stang..i would be paying for the monthly payments and the insurance..(which yea i know is going to be INCREDIBLE)..but i think i will be able to handle it. I know most of you are thinking why not just supercharge/turbo the tc and mod it..WELL ITS MY PARENTS GOT ME THE DUMB 4 SPEED AUTO!! EVERYONE KNOWS U CANT MOD AN AUTO ITS JUST GAY!! So what i need to know is that if this all sounds logical and doable..no negative answers...