Believing you're a good person and actually being one are two completely different things.
Being a good person is not always easy in the modern world, where avarice and greed seem to be rewarded while compassion and integrity seem to be punished. Following basic morals and living your life being true to the values and principles that you hold can be difficult, especially when others do not follow the high road. Being a good person means doing what is right even when this is the hardest route to follow, and treating others in the way that you hope they would treat you.
Believing you're a good person and actually being one are two completely different things.
My moral in life is simple, you treat me good and I'll definitely treat you better.