Your parents are tight on cash because they buy bird after bird! They can't even afford internet! They want to get a $200.00 gift for your brother!
My advise to you is, don't even bother getting into arguments with them! Continue to work, and save up as much money as you can, and don't give up on school.
I'm assuming you don't live in a city, or you wouldn't need a car. So, if you move to a city you can use public transportation. If you can't move, get a bicycle, or walk. Walking is good excise!
About the birds! Maybe your parents should buy chickens, that way if all goes south they can serve them up for dinner. And why don't they use your internet? I'm assuming you have access with 1044 posts!
On the bright side, you have a roof over your head, food in your stomach, clothes on your back, school, and a job. You just have to stick to a reasonable goal, and work toward it. It's not going to happen by itself.
Good Luck! If all else fails, you can always become a writer... B)