The first meeting I ever went (in) to the lady running the show said to me "it's so great you came in. My first meeting 20 years ago I had to be dragged in with a friend"
It's perfectly normal. I sat in my car in the parking lot several times before actually going inside. Once I did go in though, I was so glad I did. I don't attend regularly anymore, my group disbanded and I don't care too much for the other group, but boy did it save my life at the time.
No one inside is going to judge you. They have all been there. It's a comfort to talk to people who know what you are going through and understand. Just do the best you can and keep trying.