I have at&t and i need to now if this will work?

I'm 13. I have at&t and i'm in a family plan. My moms upgrade is ready so she's using it to get an iphone 5. I really want to get an iphone 5 as well because i have an iphone3gs thats cracked and barely functionable. But the thing is my upgrade isn't till next august. Is it possible for me to get the upgrade now? Anyway at all. I really need this upgrade. If so what do i tell them?

Customers who pay their bills on time sometimes get rewarded for it. Ask them, they might make you a deal.