How did this happen?

I'm sixteen and I just found out I'm pregnant. I know, I should've been on birth control. But my boyfriend and I used condoms every time we did it, so even still, I shouldn't have gotten pregnant. He wants me to keep it but I don't know. I feel like it's not fair to my family for me to keep the baby because I still live with them, but I feel like it's not fair to the baby to give him/her up or abort. I'm terrified. Does anybody have any advice?