Don't worry Peter - you're not the only one. I still use cheat sheets on occasion as there are too many songs to learn that I enjoy singing and I prefer that to stopping in the middle of a song because I can't remember the next line.

The first singaround club that I went to back in 1999 had a number of people guilty of singing the same old same old week after week and, when I go back there occasionally, they are STILL doing it! One of the regulars was rather impressed that "You've added some new songs to your repertoire!"