How would you know you’re a good person?

You could do as God will do and compare yourself to His law:
The 10 Commandments
So let’s go through them and see how you do…

#1
YOU SHALL HAVE NO OTHER GODS BEFORE ME
Do you love God more than anything? Do you put him before and above absolutely everything else in your life?

#2
YOU SHALL NOT MAKE FOR YOURSELF ANY GRAVEN IMAGE
Who or what do you worship? Is it God, or something else? Do you recognize the true, living God, or a “god” of your own making? Do you believe in the God of the Bible, or the one in your imagination who has no standards and won’t judge you? That is not God, that is an “image” of God. The bible warns that no idolater will enter the kingdom of God.