This song is a strong religious song about one's faith in God. It is a song about a person saying they are not afraid of publicly displaying their faith. But at the same time they are saying that they are "not okay", meaning that the don't want to be afraid, but at times they are. This is where the "masquerade" comes in. This person is a person that wants to serve God publicly and show their faith publicly but at times he or she is uncomfortable or unwilling to do so.
I think this is an amazingly written and played song that deals with a struggle that many people have and go through on a daily basis.