You don't need to do anything you don't want to do. Groups vary tremendously. Some people want to share, others prefer to listen.
If you are asked to share and wish not to, kindly state your wishes and "pass". It should be left at that.
I have had to be careful with "promises" I make, as I tend to over promise, then must be careful when under-delivering.
I have an addictive personality, running and cycling are a passion for me. While "we" do tend to get labeled, lol, and perhaps for good reason, working out will relieve stress and tension. Sure would rather be known as a workout fanatic than a drinker.......
Suggest: this is a process, not an event. Often we don't get the recognition we would like. This is life changing behavior. One drink along the way, and some may just shake their heads and say, "I told ya' so...." Talk about starting over.
It takes time. You are on the right path. Time to take the next step?