Same here, born Catholic, baptized in a Southern Baptist Church in my early 30s. I dislike the term Protestant, maybe because growing up there was a girl in my class whose mother was Anglican and the nuns forbade us from even talking to her. I never understood what was wrong with her, other than she was a (whisper) Protestant. But between you and me, she did not have horns, or a tail, or a fork. She was just a very sad little girl. Anyhow, my husband-to-be took me to his church one weekend and I knew I had finally found Jesus!
It was not made in a derogatory sense. I just know two things.
First, you don’t have the entire Bible if you are using the KJV.
Secondly, because I have never owned or perused a KJV, I have no idea about the footnotes.
Catholic Bibles have approved footnotes that have been there by scripture scholars. Study bibles have even more.
BTW, if you are a baptized Catholic you will ALWAYS be a Catholic. Your baptismal mark does not go away. Were you also confirmed in the Catholic Church?