Before we get into the examples of what we should be saying to ourselves, it would be beneficial to recognize what types of phrases we should not be saying.
What NOT to say:
Nothing ever goes right. (a.k.a. Could just one thing go right?)
I'm no good at ... (fill in the blank) (a.k.a. I'm not that creative/smart/ambitious)
Why should I try? It won't work out anyway.
I can't get caught up. (I don't have enough time. This is too much work.)
I've tried, I can't.
What is wrong with me today? (a.k.a. Why isn't my mind working?)
It's just not my day.
I'm so tired.