Will being under nitrous oxide scare me?

So Im getting my wisdom teeth out soon, and honestly I've heard it feels really good to be under nitrous oxide but ive also heard people see little frogs and funny looking stuff and honestly that stuff scares me. Im not trying to sound weird, but even just smoking weed..when I tried smoking weed I felt like it was acid or soemthing, even though i never tried it..weird i know. I just saw a bunch of colors and I didn't like the feeling. Anyway has anyone ever been scared while on nitrous oxide?