I like to pair "affirmations" with actual things I have done so I have the "definition" of "good person" in a concrete way I can see? In what way are you a good person? Are you kind? Describe a situation in which you have been kind. Are you helpful? Describe a situation in which you helped another. What does it mean to you to be a "good" person. Figure that out and then go find examples where you have been that person. Just stating words without any "images" behind them isn't a whole lot of use? "I am a good person" is meaningless to me, you might as well be "nice". What does that mean? That you don't kill people? :-) That you smile a lot and speak softly? So what?