If you kill the baby yourself you'll both go to jail. Get some sort of a loan and have the abortion. Too young to get a loan? Then tell your parents to pay for it for you. (don't know if you're trying to hide this from them) but if you do not go through with the abortion, they'll just find out about it later instead, when the baby is born. Then you have to fork over tens of thousands of dollars to take care of your kid for the rest of your life.
So, tell your parents and maybe they'll help you. Granted, they'll be pissed but as long as you get rid of it right?
or
Don't tell them, let the baby be born, then they find out anyways and get pissed off even worse.