Do you think you are a good person?

I have been working on repeating positive phrases to help me overcome my inertia, and I am noticing the language I choose is unhelpful. One thing that I feel the need to say to myself constantly is,

"I am not a bad person."

As I continued to say that to myself, I noticed that it was centered on the negative, so I started trying to say,

"I am a good person."

I have yet to repeat it more than twice. I start to feel queasy. I guess I don't believe that it's true of myself.

How can I break through to a place where I can allow myself to see myself as a good person? I am genuinely realizing for the first time that I have not once seen myself as a good person, and I am not sure why.

Yeah, I've done bad things. But why did I do them? And why didn't they? I just want to know.