Please, PLEASE don't use autotune. It's my natural enemy. It's not that hard to sing in tune and it doesn't make your voice sound better, after all. Autotune is meant for small corrections and not for an excuse for being too lazy to sing in tune.
That being said, you don't seem to have a bad voice, but according to what it sounds like, you either sing out of tune quite alot of times, or your autotune settings are wrong. So please, just practise and delete autotune, format the harddrive it was on two or three times, throw it out of the window and burn it.
Thanks.
[/rant on autotune]