You become Superman. How long before you turn evil?

Pretty much the title. You become superman at his most powerful. Trouble is, there are no supervillains, no kryptonite. You live in this world, as it is today.

Hell, you can even turn back time if you mess up too bad. So how long do you think you would last? What would you do do prevent your absolute power from corrupting absolutely?

EDIT: Thanks for everyone who commented. Most people are blatantly honest, but several also believe they would hold the moral high ground and do nothing but attend to their own family's needs. Which is always something I think about. If superman has the ability to stop evil, but doesn't, does that make him evil? Or is it more evil to mold the world in the way he sees fit? Trolley problem at it's heart, I suppose.