I don’t want kids and he does. what do I do?

I just found out I’m pregnant and honestly I do not want it. I think it will ruin my life and change is abruptly which I’m not ready for just yet because I’m fairly still young. But I told him a while ago and he is very against abortion and wants to raise this kid we are both 19. He keeps saying he’s excited for it and all this stuff but I’m not I’m worried sick and his excuse is that “we already done “it”” so this is what happens. Well he’s wrong because there are other options. Also my entire family is very hardcore INSANE Christian’s who would most likely hate this entire thing. It’s just a lot and I need to find a way to make him realize this isn’t a good idea
I don’t want kids and he does. what do I do?
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