Going on 10 months at my job. I feel like its the beginning of the end to be honest

I have this presentation on presenting the pricing process to product managers and i have no idea what i was talking about when doing a mock presentation with coworkers and my manager. I was stammering words, mispronouncing, forgetting stuff, etc. I feel like im really just hanging on and will eventually be laid off, fired, or quit to be honest.