I've gone through NA (forced through it, however), I've been institutionalized for it, I was in Juvie for it when I was younger, and like you, all I found was more people to buy from and deal to and of course, newer, funner drugs to play with.
Besides, I'm not one to ask for help from anyone. It's something I have to get through on my own.
The only thing that makes me lucky (or perhaps, it's worse for me in the long run), is that though I know I'm addicted, I've learned to control my addiction when it needs to be controlled. I've got a 7 year old son and he knows nothing about it because I've never done anything around him or while I'm with him or when I know I'm going to be with him. I've learned to control myself enough so that I only do it when I'm out on the weekend. But then again, as I said, perhaps that's worse for me in the long run because I know that because of him I'll never let myself hit rock bottom and I'll never get to the point where it's so obvious that even he would know something was going on. This may be one of the reasons it's so hard for me to quit because it's so easy for me to convince myself, at the time, that I don't have a problem.