Every moment one lives is different from the other. The good, the bad, hardship, the joy, the tragedy, love, and happiness are interwoven into one single indescribable whole that is called life. You cannot separate the good from the bad. And perhaps there is no need to do so either.
Our experiences compose our story, they make us who we are. We are able to rewrite our story any time we choose.
We can rewrite our story, but we cannot rewrite the past. We can't change anything that has already happened, but we are certainly able to make it easier to digest. We need to take a look at the issues we have accumulated and rid ourselves of the burden. Eliminate the 'bad' times and concentrate on the ones that bring us joy. Whatever happened, happened. It created fear, sadness, or resentment in you.
There is no way to change the facts, but you can change your reaction. Nothing is to be gained by continuing to resent the people that hurt you. Forgiveness will make your life much easier, it will allow you the freedom to live your life. It is a choice. Of course you wish your past life could have been different, happy and joyful at all times, but it wasn't. This is a fact, it wasn't marvelous, but here you are, you did all and lived to tell about it.
It is now up to you to make your story happy and joyful for yourself and those in your tribe. Don't give any credence to the 'bad' parts, instead direct your attention to all that is good. You write your own story, you are holding the pen, write whatever you want....decide what you want it to look like and make it so.