Killing Curse Green and Bubblegum Pink

Harry was sick and tired of surviving over and over again. So much so that he decides to take matters into his own hands. Except things don't work out the way he wants them to be. Instead he is given another chance, this time to be whoever he wants to be. All he has to do is sell his soul to Fate for it. No big deal right? His sanity doesn't seem to agree. (timetravel, WKM AU-ish)