The experiences of your life, both good and bad, shape who you are. To feel anger, sadness, regret, or hatred about those experiences means you must feel some level of those feelings about yourself.
In order to truly love and feel good about yourself, you must acknowledge and accept the negative experience as much as the positive ones.
You do not need to be thrilled about them and you don’t have to dwell on or repeat them, but you do need to embrace and be grateful for the lessons they taught you, for without them you would not be you!