WHAT HAVE I DONE TO MYSELF???

About two weeks ago, I wrote : What had I did to myself... Then I realize that sentence is wrong... I know I made a lot of mistakes because I'm not good in English, but that one is 'very mistake' aaa... a simple simple mistake. But I just leave that sentence there hoping somebody will give me the right sentence... he he he...

So, Thanks to Rizal (tak sangka ada gok orang mari kat padang pasir tandus ni) who gave me the right one : WHAT HAVE I DONE TO MYSELF...