I used to feel that way also....but i am reading that we must come to terms or accept our past, and then we can put it behind us. When we live in the past, it's like we are living in a dream. That part of our life is over. It's time to make new memories, the way that you want life to be for you.
It helps if you can say a prayer of forgiveness for those who hurt you, and also for yourself. To start fresh, each new day is a blessing.
Try to replace the negative thoughts with good thoughts of what you would like to see in your life, and you will focus more on the good stuff.
My thoughts are with you. This is a tough one for me, and it requires constant awareness of my thoughts drifting to the past, and reverting them to right here and now.
The past is gone. Let's look at what is here!
Sandra