Not only can't I cure myself from my sickness, but as the Kotzker might say, perhaps neither can G-d Himself, necessarily, for He only comes in where people "let" Him in.
The 12 Steps are about letting G-d in, by learning how to get ourselves out of the way. This is not always simple for people who engaged for years in self-gratification. Especially since even our religious experiences are all revolving around our Teshuva, our sins, our mitzvos, our kavanah, our blah, blah, blah... you know what I mean?