One thing I do: Forgetting what is behind and straining toward what is ahead, I press on toward the goal to win the prize for which God has called me heavenward in Christ Jesus.
Forgetting past pains is not always easy to do, but it is necessary in order for you to move on. If you can't forget completely, then try remembering differently. If you can't forget how bad they hurt you, or how hard the economy has affected your finances, or whatever it is that you keep looking back on; then remember differently. Remember that through it all, God still kept you! Last time I checked, you can't press and look backwards at the same time so today, remember differently and move forward.