Our parents are who the people they are. Yes, they brought us into this world and we owe our existence to them, but they have/had a responsibility to us.
We are who we are because of them, for better or worse. Who we are is because of who we became due to their influence. If they were the best parents and served our best interests, or the worst and failed us, they are still our parents.
We don’t have to forgive them, we don’t have to love them, we don’t have to respect them, we only have to acknowledge them for how we turned out and that doesn’t depend on how good or bad they were. If you are a good person, or aren’t who you feel you should be, be greatful for their reference point.
Bad or good are just subjective references to something else, how you feel about something or someone is up to you. We don’t know your life, we don’t know your parents, and we can’t decide how you should feel because we can’t tell you how you should feel about them.
You have to live with what you feel about them, do and act as you feel you should, and be validated in knowing that being better than your worst instincts makes you better than most.
You are your own person, be the best person you can be and act accordingly.