Women who have had abortions, please read

Long story but please bare with me. So I just found out I'm pregnant. I'm 18, finishing up high school and I have no idea what to do. I was raised in a religious family where sex before marriage is the biggest sin of all. I feel like I can't tell my parents because they will never look at me the same. They would probably kick me out, but if they didn't they would make me feel like an outsider and like I committed a crime for the rest of my life. I know it sounds extreme, but its true. If it were up to me, I would give up the baby for adoption without them ever finding out that I was pregnant. But as I am 18, I think thats kind of impossible. Abortion seems to be my only option as of now, I don't know what I'm going to do if I get kicked out. I honestly can't think of anyone that would/could take me. When on the topic of abortion, I always thought it was wrong. I thought if you know all the risks of sex and still want to have it, you shouldn't be able to run away from the consequences. That's why this decision is so hard for me. It goes against what I always believed in.