It's absolutely wonderful that you were able to quit something you knew intuitively was destroying you. You don't say if it was something dramatic that brought you to that point but it's always better if it's not, that it's rather the growing realization that your life is unmanageable (in the language of the first step of AA) and the growing willingness and determination to put an end to the madness. Congratulations.

Now, for the meeting. If you have a friend, take her or him with you. They don't have to do anything but say their first name to the group. And for that matter, that's all you have to do. No one expects you to speak initially and there is never any pressure to do so. Just go and listen and I think all your fears will completely evaporate by the end of your first meeting. It's good if it's a bigger meeting, 20 or 30 people. Until you're used to the setting, smaller groups may make you too nervous to really get the full benefit of the experience. Remember, the people in there are from all walks of life-working class, professionals, all are represented. The amount of collective wisdom you can absorb there is worth more than a year of therapy, IMHO. Just get a friend and go. If you really don't like it, you don't ever have to go back.