What is Undermining?

I couldn't find anything online explaining this phenomenon, so I took a crack at it.

It's one of my first videos I put together, so holy shit: I'm so fucking frustrated I want to vomit. I actually made this two whole months ago, but I'm only uploadiing it now because I'm so disappointed and frustrated with everything from the audio to the syncing. Am I the only one who finds the sound of their own voice super annoying? I wanna punch the monitor whenever i hear a recording of myself. I know learning a new thing's supposed to be a process, but it's hard to just let it go.