Well If its a biker place then duh. Lol they are drunk who cares. Maybe yet a different song next time. If that doesn’t work then give it up you really can’t sing.
As a karaoke veteran (albeit with no fear of crowds), I can tell that singing a song like Bon Jovi’s “Livin on a Prayer” is a layup. The crowd always loves it. Just really go for it and really try to get crowd participation and I guarantee you will soon be addicted to the spotlight.