I am a Buddhist and the first Noble truth about life is that is intrinsically tied to suffering. All people suffer in some way. So would I undo my hardships? Perhaps only one but it was not of my own doing that it came about. My cousin passed in a motorcycle accident almost 5 years ago. But my own mistakes... I cannot think of one which I would be better off without.
I am new to Buddhism but the basic principles are we need to knoww true suffering for what it is, identify where it truly comes from, see i we can remove those causes, and if we can forge a real path to removing them. That is how I look at my life now when I am having problems.