I think it's a good sign that you're feeling resentment. It says, to me, that you're addressing your feelings and processing them rather than holding them back, ignoring them, or trying to delay the discomfort. I think feeling resentment is healthy and normal and I think it's normal to feel seriously out of place in a full room of alcoholics and recovering alcoholics; they have caused you lots of pain during the course of your life.
I found that reading books on how to deal with a family member's addiction and participating on this site were more helpful to me, personally, than Alanon was. In my opinion, it doesn't matter how a person goes about improving their life. It's more about taking action to me than it is about which vehicle I used to find a resolution to my problem. SR fit me quite nicely and was easy to work into my schedule.