I feel so sorry for you man. I would love to say, why did you do
that in the first place, but it already happened, so no point
saying it. So you want a solution, there is no perfect solution.
But here are some options.
Tell the parents.
Borrow money to do the abortion. Friends? Relatives?
Teachers?
I strictly don't encourage you both to give birth to the kid cause
it's a really huge responsibility and i strongly don't believe you
both are ready for it yet, not just emotionally, but financially
too. You don't even have money to do the abortion, and you want to
raise the kid? Pay for the education? No, you don't want that. So I
recommend just borrow some money somewhere and do the abortion.
There has to be someone with some money for you. Or just borrow
from your parents, say you need $300 to get some stuff. You and
your gf add up there will be $600.