We all have parts of our lives that we wish didn't happen. We all have stories we may not want to share aloud. We all have things we wish we could erase. But I don't think deleting all the things you wish didn't happen is the best way to live. It is important to cleanse negativity from our lives, and make our story one we're proud of. But I think we can(and should) be proud of the negatives too. Bad things are a part of life. If there is no bad, you can't tell how good it feels when things feel good. You can't tell how much you love the sun until you'e stood in the rain.
Most times, even if something bad or negative does happen to us, we grow from it. We use our negative experiences to help shape our positive ones, and make the road clearer for us. You are not a replication of the negative things you have faced. instead, you are a strong warrior who has overcome many many challenges in your life. Because of this, you will not be defined by the things you hate most about you, or the things that have happened to you in the past. You will instead, learn to use them to drive your motivation towards being a better you for you, and a you that makes you happy. Instead of dwelling on the negatives and saying something like "that was a really and part of my life," you could benefit from learning to say "I'm stronger because of that." You will learn in time that you needed that thing to happen to you, whether it was a death, or a breakup, or a loss of a friendship, or even a bad grade. You needed that to happen, and everything happens for a reason. I'm a strong believer in this, and I do think that there is a reason for everything. Even if it may seem like you are getting a ton of negativity all at once, I believe that this is because you are stronger enough to handle it, and you are in the best position to understand why these things happen to us.
Because our negative experiences are so important and vital to our growth as people, I don't think it is in our best interest to always try to pretend that our past encounters didn't happen. I don't think it's the best idea to delete old photos or memories you may have from a time that turned out to be bad for you. Our brains keep memories, and often try to block out memories that were not enjoyable, because our brains don't want us t one traumatized anymore by the event simply from remembering it. The brain wants to remember the good things, and the parts of time where you smiled so hard your cheeks hurt, or you laughed so hard you cried, or the times where you felt so loved and so overjoyed that you didn't even know what you did to deserve such a happy life. Our brain likes to remember these things, but without the times where your heart felt heavy and your eyes filled with tears, we wouldn't be able to fully appreciate the happy times. You wouldn't be able to feel stronger than any force in the world, and you wouldn't be able to appreciate the times that you have overcome negative influences in your life.
It may seem like the times that you've been hurt or sad or mad or heartbroken have been he worst times of your life, and it may not be the times you were most proud of. But I do not think this should hold you back from living your best life and finding the happiness you deserve along the way. I don't think pretending your past didn't happen is the best way to approach a negative situation. You don't need to destroy or delete memories and photos and bonds from your past, unless that helps you grow. We have to learn from our past, and learn to use the better parts of it to make our future. The most important thing in my opinion is to do things that help you grow and try not to let yourself dwindle on the past for too long, because you simply can't go backwards.