Debating Abortion

Recently found out I’m about 4 weeks pregnant, although excited, still scared with what comes with pregnancy and becoming a parent. The dad is in the picture and seemed also excited with a bit of nerves. We are both in our early 20s but still both live at home. I’m thinking of an abortion, however not telling the dad. I think it’s my body my choice, but don’t know if this makes me a terrible person?

It’s a very stressful situation because I know that we are not ready to do this, but I feel some guilt not including him in the decision. I also feel he would be very upset if I tell him my decision (for religious beliefs).

Can anyone help?? Or have advice??