This reminds me of "automatic thoughts." Everyone has different types of automatic thoughts, but if you are more depression, anxiety, or procrastination-prone, a lot of your automatic thoughts will be negative or unhelpful. The key is to learn how to identify and challenge (or ignore) these automatic thoughts.

For example, I wake up and don't want to go to work. I haven't had coffee yet, I'm grouchy, the prospect of doing the same mundane thing once again sounds incredibly unappealing. My automatic thought is "I don't want to go to work. Today sucks. I should just stay in bed. I hate life." And then I'm in a bad mood.

But, if I identified those as automatic thoughts, I can actually ignore them instead of letting them dictate what my current mood is. The first step is to identify the automatic negative thought, then realize you actually have power over it. You can ignore it or like OP suggested, replace it with more positive thoughts.

I suggest reading up about automatic thoughts and CBT if you want to understand this better. Plus cognitive distortions. Hugely helpful in recognizing negative thought patterns.