Having been in a similar leaky boat and currently in counseling for similar issues, I really feel for you.
I personally believe that by ensuring a high level of peer pressure, a group keeps you more worried about what others think even to the extent of trying to predict their reactions to attempt to prevent any discomfort. This ensures that your thoughts and energies are taken up with this activity so that you aren't spending that time reflecting on what it is that you think and believe.
I too would recommend getting the support of a counselor. Additionally, try to gently set some boundaries. Listening to their horror stories about those who left isn't doing you any good. You may want to consider gently redirecting the conversation. Bonus points if you can do it in a spiritual manner Example: Sister Yapsalot says, "Such a shame about brother evil doer. I hear he has totally gone over the deep end with wine women and song". You could respond, "If that's the case it is a shame. But I don't feel comfortable discussing it. I think Jehovah would rather we dwell on the things above"
Also, make it a priority to tell yourself that all you have control over are your own thoughts and actions, not those of others. Try to spend some time determining your own thoughts and beliefs.
This won't do away with what you may have to face in the future when you leave, but it may help you feel a little more in control of the situation.