That's sorta the point, live you life without regrets or don't let the things you didn't do cause you regret. If you didn't do it, you must have had a reason, we can always dwell on what ifs. But you always have a choice. May not always be the best but for you at the time what you did meant something to you or you wouldn't have done it. Don't second guess yourself and just do what's best for you at that time. That's all anyone can hope for, to do what's best for themselves.