Remember that there is always adoption, and you could do an open adoption that would allow you to see your baby still. I don't believe that abortion is ever the solution. I know it is hard to tell your parents, I was so chicken, I had my doctor tell her. I don't recommend this method.
Perhaps try writing a letter to your parents and in it express whether or not you think abortion is an option. At least then they will know your stance on it before any pushing is able to be done. Since I don't know your parents, I don't know if that would be the case, and I mean no disrespect to them.
I really don't recommend abortion for even the simple fact that many women regret it for years and sometimes for the rest of their life. If you read some of the abortion posts here in other forums, you will see what I mean.
I pray that the Lord give you guidance in what to do and how to tell your parents about it all.
God Bless.