According to Osho, feeling anger toward your parents is natural but futile: it punishes you for their unconscious mistakes, deepens your own wounds, and helps no one. See that they merely repeated inherited conditioning without awareness. Transform anger into understanding and compassion, feel fortunate to learn, and resolve to end the cycle by parenting and relating consciously, so suffering is not passed on.
Being mad at your parents mostly hurts you; they didn’t know better, so choose kindness and break the pattern.