I'm reluctant to buy more booze during my own birthday party
Why do you feel that way?
I feel I am drinking too much
Well, I think it is good you will not drown yourself in drink. That could lead to a terrible and sad outcome for you and possibly others.
I know, but having more booze here would be awesome, their karaoke machine only plays CDs and nobody knows how to fix it.
Well that is good you can pace yourself. Do you think the person who owns the machine can fixt it soon? There are other ways to do karaoke like on somones phone.