Hi Soldier Boy,
With 55 songs in your songbook, I think you are more into collecting songs than learning them. I know, I'm like that too. Chances are you only get to sing one or two at the club. Pick those two and leave the rest behind. If they are songs no-one else sings or knows, repeat them week after week until they are well bedded in, then add another. The more the song means something to you personally, or that you can identify with, the easier it is to learn. Comic songs are probably easier to learn as they are like telling a long joke.
Another trick is to sit beside a mate that knows your songs nad can give you a prompt when things get rough.
I've seen some people use books where it is accepted. However, the spend as much time selecting a song from it as they do singing. Be decisive it what you plan to sing and go for it