Its a risky situation but its totally up to you, go talk to a perfessional and talk about the situation, talk about the risks of having the baby. Abortion isn't the only answer, I agree that it is cruel. And don't fret about when the baby gets older and asks who the daddy is, lots of kids grow up without a daddy and they turn out to be like normal kids. Alot of kids are conceived through rape and yet they are just fine. Its totally your decision its your baby don't let anyone make the decision for you, this is about how you feel about your baby!
Pm me if you wanna chat.