You are NOT stupid! I've cried alot in Al-Anon meetings, others cry, there are tissue boxes there ... many newcomers cry and don't talk for a long time, we give everyone comfort and you might find others are very loving and supportive. The meeting is a place of peace and safety. I too sat in my car a few times before I went into the building - I got out of my car 2-1/2 years ago, went in and never looked back. A life saver, once I calmed down and started focusing on my program. Be patient with yourself, you just discovered you need help - it's a process, go easy on yourself too...
God bless and good luck!!