That's fine, you don't have to be best mates with them. Whether you choose to be a passive or active member, all are welcomed and encouraged!
Your health coach will still want to check in on your progress - get your weight, waist measurement, and motivation levels. If you aren't comfortable sharing this with the group, then this can be shared in more private channels with your health coach - no problems.
What's great about these health coach channels is our dietician, Camilla, is looped in and always willing to help answer any questions you may have and provide helpful tips.