pro-ana thoughts

I don't understand how you can admit you have anorexia and continue to actively pursue that lifestyle. And I don't mean that like "once you admit you have it, you need to start getting treatment". I mean, anorexia is pretty much defined as a bad thing, so by admitting you have anorexia, you are saying yourself that it's not a healthy lifestyle, which doesn't match with actively pursuing that lifestyle. It's like someone admitting they're alcoholic, and continuing to specifically plan ways to get drunk, which is very different from admitting you're an alcoholic and not actively attempting to stop drinking.
Am I mis-analyzing this?