Charlie
You say you are afraid ....... this is normal.
You say you have explored abortion .... but it is NOT right for you. Then please don't do it.
You say your parents would disown you if you told them..... Charlie, there are alot of girls that have been in your shoes that felt the same way. And I am sure that some of them would tell you their parents were shocked at first.....but in the end they accepted it. They did so because they love them. Even though a parent can be hurt by what their children do....they do not stop loving them because of it.
You need to tell your parents. Then you need to decide if you want to keep this baby or give it up for adoption.
Do you have any really close friends that can be a good support base for you?
Have you been to planned parenthood? They can offer you alot of advice and help you to sort things out.
Does the babies father know you are pregnant?
Keep posting, Charlie. There are alot of good people here that will try and help you in whatever way they can.