If large groups of people freak you out, then seek small groups. You're in admittedly bad shape, my friend, and it ain't gonna get any better unless you do something about it. Like right now. You cannot lick this problem by yourself, and you're well aware of this. You need some serious help, some serious support. I suggest very strongly that you go to AA. Find a small group. If you don't like the people, then find another small group.
You want people who understand? These people have been through exactly what you're going through. You're not going to be talking to a bunch of people who can't relate to your problems. And this group has, for the most part, been pretty successful in recovering from their addictions. They do this by helping one another and the 12 step program of AA. You need help and it's available. The choice here is simple. You can set aside your problem with groups and get the help you need, or you can continue on your downward slide to the point where you end up in an asylum or an early grave.